P, Q and R started a business by investing Rs. 900, Rs. 1300 and Rs. 2000 respectively. After two years they invested another amounts in the ratio 3 : 1 : 5. After another 1 year, P, Q and R withdrew Rs. 200, Rs. 400 and Rs. 1000 from the business respectively. Now the profit earned from the business after 4 years from the start of the business is in the ratio of 4 : 5 : a and share of P in the profit is Rs. 1200. Find the total profit earned from the business.
A)Rs. 4100 B)Rs. 5100 C)Rs. 4800 D)Rs. 5400 E)None of these