The Shum Company makes a product, Z, from two materials: X and Y. The standard prices and quantities are as follows: X Y Price per pound $6 $9 Pounds per unit of product Z 10 5 In May, 21,600 units of Z were produced by Shum Company, with the following actual prices and quantities of materials used: X Y Price per pound $5.70 $8.40 Pounds used 212,000 168,000 Is the total direct material yield variance favorable or unfavorable? Favorable Unfavorable