How to find nominal annual rate of interest/discount?

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1) at what nominal annual rate of interest, convertible four times a year will you quadruple your investment in $15$ years?



2) the annual nominal rate of interest compounded quarterly is $i^(4) = 0.08$. what is $d^(2)$, the equivalent nominal annual rate of discount compounded semiannually?




Sorry in advance, these are homework problems that I just can't get the right answers. for $1)$ I did $(1+i)^4*15 = 4$ and get $i=0.023$, then did $(1+0.023)^4-1 = 0.0968$ but this is not the right answer. Also for $2)$ what I've done is since we know $1-d = frac11+i$, $(1+frac0.084)^2 - 1 = 0.0404$ then i found $d$ to be $0.0388$ both wrong. How do i get the right interest/discount?










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  • What is the answer for 1)? Are you close so it might be a convention thing?
    – spaceisdarkgreen
    Feb 16 '17 at 18:01











  • @spaceisdarkgreen i do not know the answer for either one
    – Allie
    Feb 16 '17 at 18:02










  • Reading the definition of nominal interest rate on wikipedia, I suspect that instead of doing $(1+.023)^4-1$ you should just do $.023*4=.0935$
    – spaceisdarkgreen
    Feb 16 '17 at 18:04














up vote
1
down vote

favorite
1













1) at what nominal annual rate of interest, convertible four times a year will you quadruple your investment in $15$ years?



2) the annual nominal rate of interest compounded quarterly is $i^(4) = 0.08$. what is $d^(2)$, the equivalent nominal annual rate of discount compounded semiannually?




Sorry in advance, these are homework problems that I just can't get the right answers. for $1)$ I did $(1+i)^4*15 = 4$ and get $i=0.023$, then did $(1+0.023)^4-1 = 0.0968$ but this is not the right answer. Also for $2)$ what I've done is since we know $1-d = frac11+i$, $(1+frac0.084)^2 - 1 = 0.0404$ then i found $d$ to be $0.0388$ both wrong. How do i get the right interest/discount?










share|cite|improve this question





















  • What is the answer for 1)? Are you close so it might be a convention thing?
    – spaceisdarkgreen
    Feb 16 '17 at 18:01











  • @spaceisdarkgreen i do not know the answer for either one
    – Allie
    Feb 16 '17 at 18:02










  • Reading the definition of nominal interest rate on wikipedia, I suspect that instead of doing $(1+.023)^4-1$ you should just do $.023*4=.0935$
    – spaceisdarkgreen
    Feb 16 '17 at 18:04












up vote
1
down vote

favorite
1









up vote
1
down vote

favorite
1






1






1) at what nominal annual rate of interest, convertible four times a year will you quadruple your investment in $15$ years?



2) the annual nominal rate of interest compounded quarterly is $i^(4) = 0.08$. what is $d^(2)$, the equivalent nominal annual rate of discount compounded semiannually?




Sorry in advance, these are homework problems that I just can't get the right answers. for $1)$ I did $(1+i)^4*15 = 4$ and get $i=0.023$, then did $(1+0.023)^4-1 = 0.0968$ but this is not the right answer. Also for $2)$ what I've done is since we know $1-d = frac11+i$, $(1+frac0.084)^2 - 1 = 0.0404$ then i found $d$ to be $0.0388$ both wrong. How do i get the right interest/discount?










share|cite|improve this question














1) at what nominal annual rate of interest, convertible four times a year will you quadruple your investment in $15$ years?



2) the annual nominal rate of interest compounded quarterly is $i^(4) = 0.08$. what is $d^(2)$, the equivalent nominal annual rate of discount compounded semiannually?




Sorry in advance, these are homework problems that I just can't get the right answers. for $1)$ I did $(1+i)^4*15 = 4$ and get $i=0.023$, then did $(1+0.023)^4-1 = 0.0968$ but this is not the right answer. Also for $2)$ what I've done is since we know $1-d = frac11+i$, $(1+frac0.084)^2 - 1 = 0.0404$ then i found $d$ to be $0.0388$ both wrong. How do i get the right interest/discount?







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asked Feb 16 '17 at 17:56









Allie

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  • What is the answer for 1)? Are you close so it might be a convention thing?
    – spaceisdarkgreen
    Feb 16 '17 at 18:01











  • @spaceisdarkgreen i do not know the answer for either one
    – Allie
    Feb 16 '17 at 18:02










  • Reading the definition of nominal interest rate on wikipedia, I suspect that instead of doing $(1+.023)^4-1$ you should just do $.023*4=.0935$
    – spaceisdarkgreen
    Feb 16 '17 at 18:04
















  • What is the answer for 1)? Are you close so it might be a convention thing?
    – spaceisdarkgreen
    Feb 16 '17 at 18:01











  • @spaceisdarkgreen i do not know the answer for either one
    – Allie
    Feb 16 '17 at 18:02










  • Reading the definition of nominal interest rate on wikipedia, I suspect that instead of doing $(1+.023)^4-1$ you should just do $.023*4=.0935$
    – spaceisdarkgreen
    Feb 16 '17 at 18:04















What is the answer for 1)? Are you close so it might be a convention thing?
– spaceisdarkgreen
Feb 16 '17 at 18:01





What is the answer for 1)? Are you close so it might be a convention thing?
– spaceisdarkgreen
Feb 16 '17 at 18:01













@spaceisdarkgreen i do not know the answer for either one
– Allie
Feb 16 '17 at 18:02




@spaceisdarkgreen i do not know the answer for either one
– Allie
Feb 16 '17 at 18:02












Reading the definition of nominal interest rate on wikipedia, I suspect that instead of doing $(1+.023)^4-1$ you should just do $.023*4=.0935$
– spaceisdarkgreen
Feb 16 '17 at 18:04




Reading the definition of nominal interest rate on wikipedia, I suspect that instead of doing $(1+.023)^4-1$ you should just do $.023*4=.0935$
– spaceisdarkgreen
Feb 16 '17 at 18:04










1 Answer
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Nominal annual interest rate is defined to be the simple interest rate for a compounding period times the number of compounding periods in a year.



So, for the first one, you correctly get the quarterly interest rate of $i=0.023$ and the answer should just be four times that



For the second, I think you did everything right except you need to double the $d=0.0388,$ since they want the nominal annual discount whereas you computed the semiannual discount.






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    1 Answer
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    up vote
    0
    down vote













    Nominal annual interest rate is defined to be the simple interest rate for a compounding period times the number of compounding periods in a year.



    So, for the first one, you correctly get the quarterly interest rate of $i=0.023$ and the answer should just be four times that



    For the second, I think you did everything right except you need to double the $d=0.0388,$ since they want the nominal annual discount whereas you computed the semiannual discount.






    share|cite|improve this answer
























      up vote
      0
      down vote













      Nominal annual interest rate is defined to be the simple interest rate for a compounding period times the number of compounding periods in a year.



      So, for the first one, you correctly get the quarterly interest rate of $i=0.023$ and the answer should just be four times that



      For the second, I think you did everything right except you need to double the $d=0.0388,$ since they want the nominal annual discount whereas you computed the semiannual discount.






      share|cite|improve this answer






















        up vote
        0
        down vote










        up vote
        0
        down vote









        Nominal annual interest rate is defined to be the simple interest rate for a compounding period times the number of compounding periods in a year.



        So, for the first one, you correctly get the quarterly interest rate of $i=0.023$ and the answer should just be four times that



        For the second, I think you did everything right except you need to double the $d=0.0388,$ since they want the nominal annual discount whereas you computed the semiannual discount.






        share|cite|improve this answer












        Nominal annual interest rate is defined to be the simple interest rate for a compounding period times the number of compounding periods in a year.



        So, for the first one, you correctly get the quarterly interest rate of $i=0.023$ and the answer should just be four times that



        For the second, I think you did everything right except you need to double the $d=0.0388,$ since they want the nominal annual discount whereas you computed the semiannual discount.







        share|cite|improve this answer












        share|cite|improve this answer



        share|cite|improve this answer










        answered Feb 16 '17 at 18:21









        spaceisdarkgreen

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