5. A debt of $25,000, with interest payable semi-annually at the rate 6%, is to be amortized by equal payments, at the beginning of each 6 months for 12 years. (a) Determine the payment. (b) At the...

can I have a formula and solution for this one, please?

Extracted text: 5. A debt of $25,000, with interest payable semi-annually at the rate 6%, is to be amortized by equal payments, at the beginning of each 6 months for 12 years. (a) Determine the payment. (b) At the be- ginning of the 4th year, after the payment due has been made, what prin- cipal remains outstanding?