I need both exercises

1. A loan of $1,000 is repaid with annual payments over 10 years. The payments in the last five years are 5 times the payments in the first 5 years. If i = 0.08, calculate the principal amortized in the fifth payment 2. Payments of S 1,000 are invested at the end of each year, for 10 years. The payments accrue 7% effective interest and the interest earned is reinvested at 5% effective. Find (a) The amount in the fund at the end of 10 years (b) The purchase price that an investor (a buyer) must pay for a rate of return of 8 % effective