18. Hoyt Axton earned $244.80 interest in 9 months in a short term savings account that paid 3.2% per year. Use the  formula P=12×I÷(R×T)P=12×I÷(R×T) to estimate the amount initially invested.  15.Charles Jones borrowed $10,000 to buy a new Toyota automobile. Citibank charged him 15% compounded yearly for 5 years. How much is the total cost of Charles' car and how much is the interest paid on this loan?  17.Bookstore sales rose 13.7% this year. If sales this year were 111,150 copies, find last year’s sales. Round to the nearest whole number.  25.

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