A invested a certain amount in a business with B as a partner. A looks after the management of the business and takes 10% of the profit as his remuneration. If B invests Rs. 12,000 and A gets a total of Rs. 4200 which includes his remuneration from the profit of Rs. 9600, then the investment of A (in thousands of Rs.) is

A

2.0

B

15

C

$$\frac{36}{5}$$

D

$$\frac{21}{8}$$