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Question No 4. The standard mix to produce one unit of product is as follows: Material A 60 units @ \$15 per unit Material B80 units@\$20 per unit Material C100 units @ \$25 per unit During the month of July , 10 units were actually produced and consumption was as follows: Material A640 units @ \$17.50 per unit Material B950 units@\$18.00 per unit Material C 870 units @ \$ 27.50 per unit Calculate material variances ( 20 marks)