Independent solution

How to solve this Annuities and Perpetuities question

Setup

Setup

Company Q's deposits remain together at 9%, forming a standard accumulated annuity.

AQ=Xs250.09=84.7009XA_Q=Xs_{\overline{25}|\,0.09}=84.7009X

Model

Model

For Company R, the 2,500 principal deposits are retained while each year's 9% interest is reinvested separately at 8%.

AR=2500+9(Is)240.08=7911.91A_R=2500+9(Is)_{\overline{24}|\,0.08}=7911.91

Compute

Compute

The two R components total 7,911.91; equating this to Q's value gives X = 93.41.

84.7009X=7911.9184.7009X=7911.91

Answer

Answer

The annual Q deposit is 93.41, which is choice D.

X=93.41(D)\boxed{X=93.41\quad\text{(D)}}