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EX 7-5 Direct materials variances The Silicone Engine Inc. produces wrist-wom tablet computers. The company uses Thin Film Crystal (TFC) LCD displays for its products. Each tablet uses one display. The company produced 580 tablets during December. However, due to LCD defects, the company actu. ally used 600 LCD displays during December. Each display has a standard cost of $15.00. Six hundred LCD displays were purchased for December production at a cost of $8,550. Determine the price variance, quantity variance, and total direct materials cost variance for December