RBI Grade B Officers 21 Nov 2015 Paper

A,B and C started a business with investments of Rs. 1,600, Rs. 2,000 and Rs. 1800 respectively. After 6 months from the start of the business, A invested Rs. 200 more. After 8 months from the start of the business, B and C invested additional amounts in the respective ratio of 4:1. If they received an annual profit of Rs. 3780 and A’s share in theprofit is Rs. 10810, what wasthe additional amount that Cinvested?