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Alvarado Company produces a product that requires 4 standard direct labor hours per unit at a standard hourfy rate of $8.00 per hour. If 3,500 units used 14,300 hours at an hourly rate of $7.60 per hour, what is the direct labor (a) rate variance, (b) time variance, and (c) cost yariance? Enter a favorable variance as a negative number. using a minus sign and an unfavorable variance as a positive number