7. In return for a loan, with money worth 6% compounded semi-annually, a man promises to pay P1,000 at the end of each 6 months for 8 years. a) Find the sum he borrows b) Find his remaining liability just after his 5th payment. c) Find his remaining liability just before his 6th payment d) Suppose the debtor failed to make his first 5 payments, when they were due. Then 3 years after he offers to discharge his accumulated liability because of the payments not made plus his liability for the future payments, by making a single payment. What single payment should he make at the end of 3 years