Answer: Loan interest = 36,000, and 66,000 yuan will be repaid one *** after maturity.

The algorithm is as follows:

The principal is 30,000 yuan, the time is 10 years, private loan, assuming that the monthly interest rate is 1 cent, that is, the interest on the principal of 10,000 yuan per month is 100 yuan , the principal of 30,000 yuan is 300 yuan of interest per month. Assuming that the interest is settled monthly and the principal is repaid at maturity, the interest for one year = 300x12 = 3600, and the total interest for 10 years is 36,000.

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