The Shum Company makes a product, Z, from two materials: X and Y. The standard prices and quantities are as follows: Price per pound Pounds per unit of product Z x $ 6 10 Y $9 5 In May, 22,900 units of Z were produced by Shum Company, with the following actual prices and quantities of materials used: Price per pound Pounds used Y 5.70 $ 8.40 199,000 285,000 Is the total direct material yield variance favorable or unfavorable