Demand for earbuds is represented by: P = 402 – 2Q The costs are $8 per set of earbuds. In order to stock earbuds, other items which average $2 in profit must be taken off the shelf. How many earbuds should you order?

Assume the total cost of a college education will be $250,000 when your child enters college in 17 years. you presently have $69,000 to invest. what annual rate of interest must you earn on your investment to cover the cost of your child’s college education? (do not round intermediate calculations. enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)