4. The following table gives salary per month of 450 employees in a factory: Salary No. of Employees Less than 5000 80 5000-10000 120 10000-15000 100 15000-20000 60 20000-25000 50 25000-30000 40 The total income of 6 persons in the group 25000-30000 is Rs. 1, 65,000. Due to a rise in prices, the factory owner decided to give adhoc increase of 25 percent of the average pay to the 25 percent of the lowest paid employees, 10 percent of the average pay to the 10 percent highest paid employees and 15 percent to the remaining employees. Find out the additional amount required for the adhoc increase and after the increase, find out the average pay of an employee in the factory