A certain sum is lent at 5% p.a. for 2 years, 9% p.a. for the next 3 years and 13% p.a. after 5 years. If the simple interest on the sum for a period of 10 years is ₹8,160, then the sum (in ₹) is:

A

8,000

B

9,000

C

8,400

D

9,600