This Exam FM sample reference tests Growing Perpetuity-Due under a Force of Interest. A 12% force corresponds to an annual effective rate of 12.7497%. Pricing the first payment at time zero and the remaining growing stream gives 58829.14, so choice C is correct.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
AChoice A uses 12% directly as an effective rate and values the payments as a perpetuity-immediate.
BChoice B converts the force correctly but delays the first payment by one year.
DChoice D treats the difference between force and growth as exactly 5% without converting the force.
EChoice E accumulates the immediate-perpetuity value for two periods rather than one.
Original practice · fully worked
Original variant: growth rate supported by an endowment
An endowment worth 30,000 funds a perpetuity-due whose first annual grant is 2,000 today. Valuation uses a constant annual force of 12%. If grants grow at rate g each year, determine g.
A 3.41%
B 4.26%
C 5.23%
D 6.18%
E 7.05%
Variant answer in brief
The force converts to 12.7497% effective. Solving the perpetuity-due price relation for growth gives g = 5.2330%, choice C.
Setup
Setup
Convert the force and write the due-perpetuity price equation.
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