A sum of ₹9,600 was invested partly at the rate of 8% and the rest at the rate of 10% p.a. simple interest. Total interest received from both the investments was ₹3,500 after 4 years. The sum (in ₹) invested at the rate of 10% p.a. was:

A

4,400

B

5,350

C

5,200

D

4,250