Assume that 3,000 units were budgeted for being produced and sold and 2,800 were actually produced and sold. Each unit is budgeted to consume 350 grams of plastic, which costs $4.00 per 100 grams. Actual results show that each unit used 341 grams of plastic at a cost of $4.50 per 100 grams. The cost of plastic is the only variable cost.

Required

Calculate the rate and efficiency variances for the variable costs.