please answer!!

In completing the order for 1,000 gallons of Auto Tonic, the company used 4,200 pounds of direct materials. Auto's standards require it to use 4 pounds of materials per gallon produced, so it should have only used 4,000 (4 . 1,000) pounds of direct materials to produce 1,000 gallons. The direct materials were purchased at a price of $3.10 per unit, but the standard cost of each pound of direct materials is $3 instead of the $3.10 actually paid. The direct materials efficiency variance is