Original practice · fully worked
Original variant: level tail implied by a target perpetuity value
A perpetuity pays 1, 2, 3, 4, 5, and 6 in years 1 through 6, then pays level amount L from year 7 onward. At 9% effective, its present value is 50. Determine L.
- A
4.35 - B
4.85 - C
5.35 - D
5.85 - E
6.35
Answer and calculation
Removing the first six increasing payments leaves a deferred level perpetuity, giving L = 5.35, choice C.
Setup
Setup
Value the six explicitly increasing payments first.
50=t=1∑6tvt+Lv6a∞∣0.09 Model
Model
At time six, the remaining level payments beginning in year seven form a perpetuity-immediate.
t=1∑6tvt=14.5783 Compute
Compute
Solving the residual-value equation gives 5.3465.
L=v6(50−14.5783)(0.09)=5.3465 Answer
Answer
The level tail payment is 5.35, corresponding to choice C.
L=5.35(C)