4.During June, Zinc Company produced 10,000 chainsaw blades. The standard quantity of material allowed per unit was 2 pounds of steel per blade at a standard cost of $5 per pound. Zinc determined that it had a favorable materials usage variance of $1,500 for June. Calculate the actual quantity of materials used by Zinc Company in June. a. 19,700 pounds b. 12,645 pounds c. 17,425 pounds d. 13,305 pounds