SBI PO 21 June 2015 Paper

A starts a business with a capital of Rs. 15000. B joins the business 6 months later from the start of the business and C joins the business 8 month later from the start of the business. End of the year their respective share in profit was in ratio of 5 : 3 : 3. What is the sum of amount put in the business by B and C together ?