From the following particulars, calculate (a) Material Cost Variances (b) Material Price Variances (c) Material Usage Variance Quantity of material purchased = 3,000 units Value of material purchased = 9,000 Standard quantity of material required per tonne of output = 30 units Standard rate of material = 2.50 per unit Opening stock of materials = Nil Closing stock of material = 500 units Output during the period = 80 tons