Answer:
7%
Explanation:
present value of an annuity = annual payment x PV annuity factor
PV annuity factor = $3,280.16 / $800 = 4.1002
using an annuity table, given 5 periods and the factor value, the i = 7%
you could also calculate it by solving:
4.1002 = [1 - 1/(1 + i)ⁿ ] / i
but it is much longer and difficult than just looking at a table