Problem 1: Warren calls home from Iraq at a rate (in dollars) of $2.25 for the first minute plus $.20 for each additional minute. If his total bill for the call is $11.65, then for how many minutes did he talk altogether? (Don't forget the first minute).
Problem 2: Lindsey is driving on the Beltway on her way to the UMUC campus. Her car is rear-ended. Fortunately no one is injured, but the bill for the car repair is $1650. The cost for parts was $1380. If the cost of labor was $45/hour, how many hours did the repair work take?
Problem 3: Mike won the lottery last year and had a total of $300,000 (after taxes) that he wanted to invest immediately. His invested a portion of the total in a 1-year CD that paid 5% annual interest and the rest in a mutual fund that paid 8% annual interest. If he earned a total of $16,500 in interest by the end of the year, how much did he invest at each rate of interest?
If Mike had reversed his investments in problem #10, how much interest would he have earned in that year?
Problem 4: The formula for simple interest is I=PRT , where I is the interest earned, P is the principal (or initial amount deposited), R is the annual simple interest rate in decimal form, and T is the time in years. If Inez invests $1000 at an annual rate of 6% simple interest, how much interest will she earn in 5 years?
Problem 5: If the area of a circle is given by , and an extra-large pizza has an 8-inch radius, approximately what is the area of an extra-large pizza? Round your answer to the nearest whole number.