Mukul lent ₹9,300 on simple interest in two parts. He earned interest at 5% per annum on the first part and at 8% per annum on the second part. The total interest he received after 4 years is ₹2,400. What is the ratio of the money lent at 5% to that lent at 8%?

A

5 : 8

B

8 : 5

C

15 : 16

D

16 : 15