Ricco was reviewing the water bill for his carwash business and determined that the highest bill, $6,000, occurred in July when 2,000 cars were washed. The lowest bill, $4,500, occurred in February when 1,000 cars were washed.
.What was the variable cost per carwash?
◦ $4.50
◦ $3.00
◦ $1.50
◦ $0.67