10

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 total fixed costs was A) $4,500 B) $5,400 C) $6,300 D) $7,200 E) none of the above