Sherwin Chemicals produces commercial strength cleansing supplies. Two of its main products are window cleanser that uses ammonia, and floor cleanser that uses bleach. Information for the most recent period follows: Product Names Direct materials information Standard ounces per unit Standard price per ounce Actual quantity used per unit Actual price paid for material Actual quantity purchased Price variance Quantity variance Flexible budget variance Number of units produced Window Cleaner (ammonia) 16 oz. $0.75 20 oz. $1.00 Floor Cleaner (bleach) ? 24 oz. 100 22 oz. 1,500 oz. 2,800 oz.. $0.90 $300 U ? $300 U $665 F 168 What is the direct materials flexible budget variance for ammonia?