A TV set is priced $6000 and the shop works with a credit card company to provide a twelve months interest-free installment to the buyer and the first payment is made when purchased. However the shop has to pay the interest to the credit card company with the nominal rate of interest 12% convertible monthly. The shop owner decides to provide the buyer an option that if the buyer makes the full payment when purchased, he only pays the present value of all twelve installments. How much the owner should ask if the customer decides to make the full payment when purchased