Answer:
A. 6,86%
Explanation:
We use the formula present value to future value and we clear the interest:
Present value(PV)=future value (FV)/ (1+interest(i))^number of periods(n)
PV=FV/(1+i)^n
(1+i)^n=FV/PV
(1+i)=(FV/PV)^(1/n)
i=((FV/PV)^(1/n))-1
For this problem:
i=(($17,000/$10,000)^(1/8))-1
i=0,6857
i= 6,86%