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15. Buckeye Donut (on High Street) sells donuts. The fixed cost is $200. It takes 25 cents to make a donut. Each donut is sold for 75 cents. a. How many donuts have to be sold to break even? b. How many donuts have to be sold to make a profit of $200? c. Suppose the shop sells 300 donuts. Calculate the profit/loss. 16. Find the domain of 22( )56f xxx17. Solve the following equations: a. log262xg. 2log104xb. 245125xh. 44loglog 243xc. 51399xi. 2log5log4xxd. log212xxj. 555log 2loglog 9xe. 153 412xk. log (74)3xf. 2514xel. 3457x18. Suppose consumers will demand 40 units of a product when the price is $12.75 per unit and 25 units when the price is $18.75 each.a. Find the demand equation, assuming that it is linear. b. Find the price per unit when 37 units are demanded. 19. A trust for a child’s education is being set up by a single payment so that at the end of 15 years there will be $50,000. If the fund earns interest at the rate of 7% compounded semiannually, how much money should be paid into the fund? 20. A debt of $3000 due six years from now is instead to be paid off by three payments: $500 now, $1500 in three years, and a final payment at the end of five years. What would this payment be if an interest rate of 6% compounded annually is assumed? 21. A debt of $600 due in three years and $800 due in four years is to be repaid by a single payment two years from now. If the interest rate is 8% compounded semiannually, how much is . 25