This Exam FM sample reference tests Forward Interest Rate. Indifference requires the five-year spot accumulation to equal three years at 5.75% followed by two years at the forward loan rate. Solving gives 9.53999%, choice D.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
AChoice A uses the four-year spot rate even though the replacement loan covers years 4 and 5.
BChoice B repeats the five-year spot rate rather than extracting the forward rate after year 3.
CChoice C averages the three- and five-year spot rates without matching their compound accumulations.
EChoice E subtracts the spot rates and scales the difference linearly instead of solving the two-year factor.
Original practice · fully worked
Original variant: three-year forward rate from two spot rates
The annual effective spot rate is 4% for a two-year investment and 6% for a five-year investment. Determine the constant annual effective forward rate applying over years 3 through 5.
A 6.00%
B 6.82%
C 7.35%
D 8.00%
E 9.12%
Variant answer in brief
Equating five-year accumulation to two years at 4% followed by three forward years gives a forward rate of 7.3547%, choice C.
Setup
Setup
Let f be the annual forward rate for the three years after time 2.
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