Management has determinined that each medium-sized box has a standard materails cost of $1.20 when 4 pounds of raw materail at a cost of .30 per pound are used. The static budget for the month of march showed and estimate production of 15,000 boxes in March. During March 17,000 boxes were actually produced. The actual cost for each box was 1.56 when 3.9 pounds of raw materail at a cost of .40 per pound were purchased and used. What should be the total direct materails cost according to Violetta's flexible budget for March?
A. 23400
B. 20400
C. 26520
D. 18000