Contemporary Mathematics for Business and Consumers 7th Edition by Robert Brechner ,George Bergeman

Exercise 37

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 the ten years from 1999 to 2009, the number of jets for sale increased significantly. 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.