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Standard Costing We produce concrete birdbaths which require 1.5 lbs of sand and .75 direct labor hours. The sand costs $.10 per lb and our hourly labor rate is $20. We produced 600 birdbaths in May and incurred the following material and labor costs: Direct material Direct labor 860 pounds @ a total cost of $129 480 hours @ a total cost of $9,744 Calculate a rate (price) variance for direct labor. Calculate a quantity variance for materials.