Original practice · fully worked
Original variant: annual yield from two quarterly annuity values
A level quarterly annuity has value 5,000 at the time of its first payment and accumulated value 7,000 at the time of its twelfth and final payment. Determine the equivalent annual effective interest rate.
- A
10.00% - B
11.50% - C
13.02% - D
14.50% - E
16.00%
Answer and calculation
The two value dates are 11 quarters apart; their ratio gives 3.106% quarterly and 13.02% annually, choice C.
Setup
Setup
The first and twelfth payment dates are separated by eleven quarterly accumulation periods.
5000(1+j)11=7000 Model
Model
Their value ratio directly determines the quarterly accumulation factor without needing the payment amount.
j=1.41/11−1=0.0310610 Compute
Compute
The quarterly rate is 3.10610%; compounding it over four quarters gives 13.01536%.
i=(1+j)4−1=0.1301536 Answer
Answer
The annual effective rate is 13.02%, corresponding to choice C.
i=13.02%(C) Calculator reproduction
BA II Plus keystrokes
- 2nd CLR TVM; 2nd I/Y; 1 ENTER; ↓; 1 ENTER; 2nd CPT; 2nd PMT; if BGN is displayed, 2nd ENTER; 2nd CPT; 11 N; 5000 +/- PV; 0 PMT; 7000 FV; CPT I/YI/Y = 3.1061 per quarter; annual effective = 13.0154%END mode; the first and twelfth payment dates are 11 quarterly periods apart.