A, B and C enter into a partnership and invest ₹1,100:₹1,300 and ₹1,700 respectively. After few months an additional capital of ₹500 is invested by B. After 12 months they closed the business with a profit of ₹2,527. A's share of profit was ₹627. How many months after the start of business B invested the additional capital  ?

4