Ms. McClure is thinking about getting her master's degree in education. She estimates that she will spend about $12,000 a year for three years to get her degree. Her plans are to take evening classes so she can keep her current teaching job. When she finishes her degree, she will get a $5,000 a year raise. Required:
How long will it take her to recover her investment?

Until recently, hamburgers at the city sports arena cost $4.70 each. the food concessionaire sold an average of 13 comma 000 hamburgers on game night. when the price was raised to $5.40, hamburger sales dropped off to an average of 6 comma 000 per night. (a) assuming a linear demand curve, find the price of a hamburger that will maximize the nightly hamburger revenue. (b) if the concessionaire had fixed costs of $1 comma 500 per night and the variable cost is $0.60 per hamburger, find the price of a hamburger that will maximize the nightly hamburger profit.