Independent solution

How to solve this Loan Balances and Amortization question

Setup

Setup

Compute the level annual payment and total under option 1.

R=1500a200.05R=\frac{1500}{a_{\overline{20}|0.05}}
T1=20RT_1=20R

Model

Model

Under option 2, total principal is 1,500 and total interest is i times the arithmetic sequence of opening balances.

T2=1500+ik=019(150075k)T_2=1500+i\sum_{k=0}^{19}(1500-75k)

Compute

Compute

The balance sum is 15750. Equating T2 to 2407.28 gives i = 5.760493%.

i=0.0576049280i=0.0576049280

Answer

Answer

The annual rate under option 2 is approximately 5.76%, selecting choice C.

i5.76%(C)\boxed{i\approx5.76\%\quad\text{(C)}}