Original practice · fully worked
Original variant: ending reserve after a fixed series of anniversary withdrawals
A reserve contains 500,000 immediately before an initial withdrawal of 40,000. It earns 6% annually, and another 40,000 is withdrawn after each of the next ten years. Calculate the balance immediately after the tenth-year withdrawal.
- A
252,074.42 - B
266,902.33 - C
281,730.24 - D
296,558.14 - E
311,386.05
Answer and calculation
The original reserve accumulates ten years, while the eleven withdrawals from time 0 through time 10 accumulate as an eleven-term series. The resulting balance is 296,558.14, choice D.
Setup
Setup
Use the date immediately after the time-10 withdrawal as the comparison date.
F10=500000(1.06)10−40000k=0∑10(1.06)k Model
Model
Recognize the withdrawal accumulation as an eleven-payment accumulated annuity.
F10=500000(1.06)10−40000s11∣0.06 Compute
Compute
The resulting ending reserve is 296558.14.
F10=296558.14271448 Answer
Answer
The balance after the final withdrawal is 296,558.14, selecting choice D.
F10≈296558.14(D)