This Exam FM sample reference tests Reinvestment of Interest Cash Flows. The 30 deposits contribute 30000 of principal. At year t, accumulated deposits generate 40 times their count in interest, and those interest cash flows earn 3% to year 30. The total is 53433.89, choice B.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
AChoice A credits 3% to all deposits directly instead of only to withdrawn interest cash flows.
CChoice C lets the 4% fund interest remain in the original fund and compound at 4%.
DChoice D treats each 1000 deposit as earning both 4% and 3% on the full balance.
EChoice E accumulates the annual 4% interest for one extra year after the year-30 valuation date.
Original practice · fully worked
Original variant: accumulated interest separate from principal
An investor deposits 500 at each year-end for 12 years. Each deposit earns 5% annually, but every year's interest is withdrawn immediately and reinvested at 2% until year 12. Determine the year-12 value attributable only to reinvested interest, excluding the 6,000 principal.
A 1,284.60
B 1,512.48
C 1,765.11
D 2,041.77
E 2,315.60
Variant answer in brief
At each year-end the prior deposits generate 25 each. Accumulating the resulting triangular interest stream at 2% gives 1765.11, choice C.
Setup
Setup
Each completed deposit-year produces 25 of withdrawn interest.
500(0.05)=25
Model
Model
At year m+1, m prior deposits produce 25m; carry that amount to year 12 at 2%.
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