A sum of ₹ 10,200 is invested partly at 8% per annum and remaining at 6% per annum for 3 years at simple interest. If the total interest is ₹ 2,124, how much money was invested at 6% per annum?

A

₹ 4,800

B

₹ 4,900

C

₹ 5,200

D

₹ 5,400