This Exam FM sample reference tests Equivalent Growing Annuities. The twenty increasing payments have present value 52732.61. In the thirty-payment due annuity, growth equals yield, so each discounted payment equals k and the value is 30k; hence k = 1757.75 and choice A.
These notes identify the calculation error associated with each wrong letter when that error is reproducible.
BChoice B values the first annuity as due, advancing its entire stream one year.
CChoice C ignores growth in the first annuity and uses a level-payment factor.
DChoice D discounts the second annuity's payments without applying their matching 4% growth.
EChoice E divides by only twenty payments when converting value to the second annuity.
Original practice · fully worked
Original variant: replace a growing stream with a level due annuity
A twelve-payment annuity-immediate begins with 1,000 and grows 3% annually. At a 5% effective yield, it is exchanged for a ten-payment level annuity-due. Determine the level annual payment.
A 1,105.36
B 1,184.92
C 1,270.89
D 1,344.08
E 1,421.17
Variant answer in brief
The growing stream is worth 10304.15. Dividing by the ten-payment annuity-due factor at 5% gives a level payment of 1270.89, choice C.
Setup
Setup
Discount the twelve growing payments to the exchange date.
PVG=t=1∑121.05t1,000(1.03)t−1=10,304.1494
Model
Model
The replacement stream begins immediately and has ten level payments.
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.