Aman, Rakesh and Vinay Started a business. They invested amount in the ratio 1 : 3 : 2 respectively for 7 months. After this they invested amounts in ratio 3 : 7 : 3 respectively for 5 months. The average investment of Aman and Rakesh is Rs. 3500 while the average investment of Vinay and Rakesh is Rs. 4200.
How much more money did Rakesh invest than Vinay?

Options

A. Rs. 2550
B. Rs. 1860
C. Rs. 1960
D. Rs. 1608