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During the week ended December 4 , the following actlvity took place: - 4,600 pounds of raw material were purchased for inventory at a cost of $2.63 per pound. - 1,050 cartons of finished product were produced. - 4,225 pounds of raw material were used. - 6,140 labor hours were worked at a total cost of $33,463. - \$20,569 actual variable overhead costs were incurred. Required: Calculate each of the following variances: Note: Do not round intermediate calculations. Round your "Raw materials usage variance" to 2 decimal places. Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (l.e., zero variance)