Contemporary Mathematics for Business & Consumers 8th Edition by Robert Brechner,Geroge Bergeman

Exercise 48

Solve the following word problems for the unknown. Round decimals to hundredths and percents to the nearest tenth when necessary.
Last year Keystone's corporate jet required $23,040 in maintenance and repairs.
a. If this represents 32% of the total operating costs of the airplane, what was the total cost to fly the plane for the year
b. If the plane flew 300,000 miles last year, what is the cost per mile to operate the plane
c. Sky King Leasing offered a deal whereby it would operate the plane for Keystone for only $0.18 per mile. What is the percent decrease in operating expense per mile being offered by Sky King
d. In one ten-year period, the sales of used business jets rose and fell and then rose again. Use the chart "Jets for Sale" to calculate the rate of increase of jets available in 2009 compared with 1999. Round to the nearest whole percent.