8. 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 and the lowest bill, $4,500, occurred in February when 1,000 cars were washed. What was the xed portion of the water bill? A. $3,000 B. $5,000 C. $5,250 D. $1.500