A and B entered into a business with capital ₹80.000 and ₹1,20,000 respectively. After 4 months each invested ₹20,000 more. The difference in the share of their profits in the year end profit is ₹68,000 is (in Rs) is

A and B starting capital respectively 80000 Rs and 120000 Rs 

and total capital of A = 80000$$\times$$ 4 + 80000 $$\times$$ 8 = 320000 + 800000  =  11200000 

      total capital of B = 1200000$$\times$$ 4 + 1200000 $$\times$$ 8 = 480000 + 1120000 = 16000000

           then   A : B =  11200000 : 1600000 

                    A : B  =  112 : 160  = 7 : 10 

  given that    X = 68000\17 = 4000 

then the difference in the profit  = ( 10 - 7 ) $$\times$$ 4000 = 12000 Rs   Answer