Every year an amount increases by 1/8th of itself. How much will it be after two years if its present value is Rs.64000?

Every year an amount increases by 1/8th of itself. How much will it be after two years if its present value is Rs.64000?

A. Rs.81000
B. Rs.80000
C. Rs.75000
D. Rs.64000
Explanation:
64000* 9/8 * 9/8 = 81000