An engineer borrowed $3000 from the bank, payable in six equal end-of-year payments at 8 %. the bank agreed to reduce the interest on the loan if interest rates declined before the loan was fully repaid. after the third payment, the bank agreed to reduce the interest rate on the remaining debt to 61/4%. what was the amount of the equal annual end-of-year pay­ ments for each of the first 3 years? what was the amount of the equal annual end-of-year payments for each of the last 3 years?