Question 56579
COST=FIRST HALF HOUR SERVICE CHARGE(50)+ NUMBER OF 30 MINUTE PERIODS(2) TIMES THE  RATE (37)+ THE PRICE OF THE PARTS (103)
COST=50+2*37+103=$227 


FIRST HALF HOUR=50
NEXT HOUR=37*2=74
PARTS=103
50+37*2+103=50+74+103=$227 TOTAL COST FOR SERVICE CALL.