A sum of ₹ 15,000 is invested partly at 12% per annum and the remaining at 10% per annum simple interest. If the total interest at the end of 2 years is ₹ 3,344 how much money was invested at 10% per annum

A

₹ 6,600

B

₹ 6,400

C

₹ 6,200

D

₹ 6,500