Robert wants to borrow 40000 that will be paid in 15 years with a payment of 6000 at the end of each year. After make the payment at the end of 10th year, Robert wants to shorten the repayment period of his debt so that it will be paid off at the end of the 12th year. Determine the amount of additional payments that Mr. Robert needs to pay at the end of year 10. Round the answer to the nearest unit