Princess Company uses standard costs to control materials costs. The standards call for 4 pounds of materials for each finished unit produced. The standard cost per pound of materials is $2.00. During April, 5,000 finished units were manufactured, 10,000 pounds of materials were used. The price paid for materials was $2.25 per pound. There were no beginning or ending materials inventories. Determine the flexible budget materials cost for the manufacture of 5,000 finished units. O a. $20,000 O b. $15,000 c. $30,000 O d. $40,000