Answer: 11.65%
Explanation:
The $13,241.39 is a future value amount as it is what is to be accumulated in 2 years.
Future value formula therefore applies:
Future value = Current value * ( 1 + interest rate) ^ no. of years
13,241.39 = 10,621.36 * ( 1 + i) ²
(1 + i)² = 13,241.39 / 10,621.36
(1 + i)² = 1.24667556697
1 + i = √1.24667556697
i = 1.116546267 - 1
i = 11.65%