The Quick Wash 24-hour Laundromat has 16 washing machines. A machine breaks down every 20 days (exponentially distributed). The repair service with which the Laundromat contracts takes an average of 1 day to repair a machine (exponentially distributed). A washing machine averages $5 per hour in revenue. The Laundromat is considering a new repair service that guarantees repairs in 0.50 day, but it charges $10 more per hour than the current repair service. Should the Laundromat switch to the new repair service. please put in excel format.

a) USING CURRENT REPAIR SERVICE
	W =
	LOST REVENUES =				per machine
b) USING NEW REPAIR SERVICE
	W =
	LOST REVENUES =
	SAVING IN REVENUES =
	EXTRA COST OF SERVICE =
		24x vs. 12(x+10)
	x	x + 10	24x	12(x+10)	difference
	10
	20
	5