This Exam FM sample reference tests Loan Balances and Amortization. The 5% level-payment option totals 2407.28. Under 75-per-year constant principal, the opening balances sum to 15750, so total payments are 1,500 plus i times that sum. Equating totals gives i = 5.76%, choice C.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
AChoice A (5.26%) does not satisfy the equality of total payments under the level and constant-principal options; no distinct standard one-step error is identifiable.
BChoice B (5.51%) does not satisfy the equality of total payments under the level and constant-principal options; no distinct standard one-step error is identifiable.
DChoice D (6.01%) does not satisfy the equality of total payments under the level and constant-principal options; no distinct standard one-step error is identifiable.
EChoice E (6.26%) does not satisfy the equality of total payments under the level and constant-principal options; no distinct standard one-step error is identifiable.
Original practice · fully worked
Original variant: constant-principal rate producing a specified total-payment premium
A 20,000 loan is repaid over eight years. Option A uses level annual payments at 3%. Option B repays 2,500 principal each year plus interest on the opening balance. Find Option B's annual rate if its total payments must exceed Option A's total by exactly 500.
A 3.66%
B 3.84%
C 4.02%
D 4.21%
E 4.39%
Variant answer in brief
Option A's total is 22,793.02. Setting principal plus interest on the eight opening balances equal to that total plus 500 gives Option B rate 3.66%, choice A.
Setup
Setup
Compute the eight-payment total under the 3% level-payment option.
TA=8a8∣0.0320000
Model
Model
Under constant principal, add 20,000 to interest on the eight opening balances and impose the 500 premium.
20000+ik=0∑7(20000−2500k)=TA+500
Compute
Compute
The level total is 22793.02, and solving gives i = 3.658914%.
i=0.0365891357
Answer
Answer
Option B's annual rate is 3.66%, selecting choice A.
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