Original practice · fully worked
Original variant: terminal value of a separately reinvested interest plan
A museum deposits 200 at the beginning of each of six years. Principal earns 9% simple interest each year, with every year's interest transferred to an account earning 7% annually. Find the combined value at the end of year 6.
- A
1,425.32 - B
1,525.32 - C
1,625.32 - D
1,725.32 - E
1,825.32
Answer and calculation
The six deposits provide 1,200 principal and the accumulated interest transfers provide 425.32, totaling 1,625.32, choice C.
Setup
Setup
Track fixed principal and transferred interest in separate accounts.
V6=6(200)+k=1∑6(0.09)(200k)(1.07)6−k Model
Model
At year k, source principal is 200k and its 9% interest grows at 7% until year six.
V6=1200+425.3197 Compute
Compute
The transfers accumulate to 425.3197 in addition to 1,200 principal.
V6=1625.3197 Answer
Answer
The combined terminal value is 1,625.32, corresponding to choice C.
V6=1625.32(C)