A debt of $45 000 is repaid over 15 years with semi-annual payments. Interest is 9% compounded

Question:

A debt of $45 000 is repaid over 15 years with semi-annual payments. Interest is 9% compounded monthly.
(a) What is the size of the periodic payments?
(b) What is the outstanding principal after the 11th payment?
(c) What is the interest paid in the 12th payment?
(d) How much principal is repaid in the 12th payment?

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