This Exam FM sample reference tests Reinvestment of Withdrawn Fund Interest. The ten deposits leave 100000 of principal. The annual 6% interest installments, increasing with the number of deposits, accumulate separately at 4% to 37295.27. A 55400 outlay growing to 137295.27 over ten years earns 9.5001%, choice B.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
AChoice A omits part of the side account's 4% reinvestment earnings.
CChoice C compounds the ten 10000 deposits directly at 6% instead of withdrawing interest annually.
DChoice D lets withdrawn interest remain in the original fund and also reinvests it in the side account.
EChoice E treats the 55400 outlay as if it were made over several years rather than entirely at time zero.
Original practice · fully worked
Original variant: share of value produced by reinvested interest
A savings arrangement receives 5,000 on six consecutive annual dates starting immediately. Each contribution earns 5%, but every year-end interest distribution moves to a separate account earning 3% through time 6. What percentage of the combined terminal value is held in the separate account?
A 12.84%
B 14.02%
C 15.54%
D 17.10%
E 18.40%
Variant answer in brief
The side account accumulates to 5520.52 while principal remains 30000. Thus reinvested interest is 15.5418% of total terminal value, choice C.
Setup
Setup
Each active deposit produces 250 of annual interest.
5,000(0.05)=250
Model
Model
Accumulate the six increasing interest installments at 3%.
I6=t=1∑6250t(1.03)6−t=5,520.5182
Compute
Compute
Principal remains 30000, so form the requested terminal-value share.
30,000+I6I6=0.1554177
Answer
Answer
The reinvested-interest share is 15.54%, choice C.
The 2210-page Financial Mathematics Proof Manual reorganizes 461 verified Exam FM solutions by syllabus skill and adds formula proofs, error patterns, and original worked practice.