RappRapp Travel offers helicopter service from suburban towns to John F. Kennedy International Airport in New York City. Each of its 6 helicopters makes between 1200, and 2400 round-trips per year. The records indicate that a helicopter that has made 1200 round-trips in the year incurs an average operating cost of $535 per round-trip, and one that has made 2,400 round-trips in the year incurs an average operating cost of $500 per round-trip.

. Using the high-low method, estimate the linear relationship y = a + bX where y is the total annual operating cost of a helicopter and X is the number of round-trips it makes to JFK airport during the year.

Give examples of costs that would be included in a and in

b.

Begin by selecting which type of costs

"a"

and

"b"

represent, then select the costs that correlate with that cost type, use each cost only once.

"a" =		"b" =

If

RappRapp Travel expects each helicopter to make, on average,1,800 round-trips in the coming year, what should its estimated operating budget for the helicopter fleet be?