Answer to Question #233736 in Civil and Environmental Engineering for Alan Enrico V Tuib

Question #233736
Situation 1
b) If $100 at Time “0” will be worth $110 a year later and was $90 a year ago, compute the interest rate for the past year and the interest rate next year.
c) Assume that $90 invested a year ago will return $110 a year from now. What is the annual interest rate in this situation?
Expert's answer


• Taking the case from 90$ to 100$ in a year

rate of interest per anum (annually),where A=amount and P= principal

• Taking the next case from 100$ to 110$ in a year

rate of interest per anum (annually)


• Investment was made a year ago and return was obtained a year from now so it means 2 successive years

.i.e. T=2 years

• Assuming it to be compounded annually from 90$ to 110$

,where n=no of times it is compounded annually, t= no of years

, because

• Assuming it to be simple interest

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