This Exam FM sample reference tests Annuities and Perpetuities. The first ten due payments contribute 8.10782X and the later 1.5%-growing perpetuity contributes 18.69366X; solving 45,000 = 26.80148X gives X = 1,679, choice A.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
BChoice B is inconsistent with the level block plus deferred growing-perpetuity decomposition; no distinct standard single-step error producing it is identifiable.
CChoice C is inconsistent with the level block plus deferred growing-perpetuity decomposition; no distinct standard single-step error producing it is identifiable.
DChoice D is inconsistent with the level block plus deferred growing-perpetuity decomposition; no distinct standard single-step error producing it is identifiable.
EChoice E is inconsistent with the level block plus deferred growing-perpetuity decomposition; no distinct standard single-step error producing it is identifiable.
Original practice · fully worked
Original variant: level launch grants followed by indexed support
A foundation pays X immediately and at the next four year-beginnings. Starting at year 5 it pays 1.02X, then increases every later annual payment by 2% forever. At 6% effective, the complete stream is worth 30,000. Find X.
A 1,050.00
B 1,125.00
C 1,216.37
D 1,300.00
E 1,400.00
Variant answer in brief
The five level payments plus the year-5 growing tail have factor 24.66349, giving X = 1,216.37, choice C.
Setup
Setup
The initial five payments occupy times zero through four; the indexed sequence begins separately at year five.
PV=Xt=0∑4vt+Xv51−1.02v1.02
Model
Model
Value the finite level block directly and the later sequence as a growing perpetuity deferred five years.
PV=24.663494X,v=1/1.06
Compute
Compute
At 6%, the two components combine to 24.663494 times X.
X=30000/24.663494=1216.3727
Answer
Answer
Dividing 30,000 by that factor gives 1,216.37, which is choice C.
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