Abhishek and Kushal entered into a partnership investing Rs. 32000 and Rs. 24000 respectively. After 3 months, Abhishek withdrew Rs. 10000 while Kushal invested Rs. 10000 more. After 6 more months Mukesh joins the business with a capital of Rs. 42000. Out of a total profit of Rs. 4370 after one year,find the amount by which the share of Kushal exceeds that of Mukesh.