9

November was the month of highest activity level; total maintenance costs were $74,500; and the number of units produced was 40,000 . July was the month of lowest activity level; total maintenance costs were $36,000; and the number of units produced was 18,000 . Using the "high-low" method of cost estimation, the variable rate is per purchase order. A) $1.50 B) $1.75 C) $2.00 D) $2.25 E) none of the above