The management team looked at the electric bill for its business and determined that the highest bill, $5,000, occurred in July when 3,000 cars were washed and the lowest bill, $4,000, occurred in February when 1,000 cars were washed. What was the fixed portion of the electric bill? (Round intermediary calculations to the nearest cent. Use the "high" data month to calculate your final answer. Do not use the "low" month, as it will result in an approximation of the cost.) OA. $4,500 B. $500 C. $3,500 D. $1,500