A landscaping contractor has received a contract to plant shrubs for a new subdivision in a nearby city. He intends to send one of his supervisors, who will employ a crew of workers in that city to perform the work.

The subdivision contains 30 houses with basically similar landscape plans. She has been asked to bid on performing the landscaping services for 5, 10, 15, 20, 25, and 30 houses. She knows from experience that she can expect a 95 percent learning curve.

She also estimates that the first house will require 28 hours.

a. How much total time will the first 5 houses require?

b. How much total time will the last 5 houses require if 30 are landscaped?

c. What will be the average number of hours per house if all 30 houses are landscaped and a 95 percent learning curve is appropriate?