Alvarado Company produces a product that requires 9 standard direct labor hours per unit at a standard hourly rate of $21.00 per hour. If 4,700 units used 43,100 hours at an hourly rate of $19.95 per hour, what is the direct labor (a) rate variance, (b) time variance, and (c) cost variance? Enter a favorable variance as a negative number using a minus sign and an unfavorable variance as a positive number