In the month of May, Williams Company produced 5561 units of a product. The standard cost card indicates the following materials standard per unit of output: 1 kilogram @ $0.5 = $0.50. During May, 15676 kilograms of material were purchased at a total cost of $7048 and 6998 kilograms of materials were used. What is the material quantity variance for May? Note that a negative number indicates an unfavourable variance. Select one: $-790 $790 $718 $-718