Question

A dollar invested today grows to $1.10 in six months. What is the effective annual rate...

A dollar invested today grows to $1.10 in six months. What is the effective annual rate if you deposit your money in a bank for one year? please explain details.

A.

21%

B.

5%

C.

None of the answers are correct

D.

10%

E.

20%

Homework Answers

Answer #1

The right answer of the question is A. 21%.

The reason behind the asnwer is the concept of compounding.Compounding can be annual, half-yearly, quarterly and even monthly. Interest on compounding builds on the accumulated interest earned. In short, we are able to earn interest on interest. So, when the dollar invested grows to $1.10 in six months that means at the end of the year we are going to earn further interest of 10% on $1.10 and not $1. Here the interest rate is 10% half yearly.

Formula to calculate FV is, FV = PV * (1+i)^n where, PV is the present value of today's investment, i is the nominal interest rate and n is the compouding frequency.

FV = 1 * (1+0.10)^2 = 1.21

Therefore, the effective interest rate earned after the end of one year is 21% on the investment of $1.

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