This Exam FM sample reference tests Equivalent Interest Measures. Equating the nominal-discount accumulation with the force-of-interest accumulation gives n = 16.568 years, which rounds to choice B.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
AChoice A treats the nominal discount rate as a nominal interest rate and uses accumulation factor 1.03 per quarter.
CChoice C rounds the logarithmic coefficient before solving for n.
DChoice D uses four times 3% as an annual effective rate rather than applying four quarterly discount factors.
EChoice E converts the force of interest to a simple annual rate instead of using exponential accumulation.
Original practice · fully worked
Original variant: initial deposit under two accumulation laws
Fund A earns a nominal annual discount rate of 8% convertible semiannually. Fund B receives 500 and earns a constant force of interest of 6%. Determine the deposit in Fund A that makes the two balances equal exactly seven years from now.
A 396.18
B 412.64
C 429.71
D 447.92
E 468.35
Variant answer in brief
Equating the seven-year accumulation factors gives an initial Fund A deposit of 429.71, which is choice C.
Setup
Setup
The half-year discount rate in Fund A is 4%, so its half-year accumulation factor is 1 divided by 0.96.
d1/2=0.08/2=0.04
Model
Model
Seven years contain 14 half-years. Equate Fund A's accumulated deposit X to Fund B's force-of-interest balance.
X(0.96)−14=500e0.06(7)
Compute
Compute
Move Fund A's accumulation factor to the other side and evaluate.
X=500e0.42(0.96)14=429.7055
Answer
Answer
The required initial deposit is approximately 429.71, so choice C is correct.
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