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The standards for one case of liquid weed kller are as follows: During the week ended May 6 , the following activity took place: 5,559 machine hours were worked. 29,553 pound of raw material were purchased for inventory at a total cost of $271,297. 4,180 cases of finished product were produced. 29,110 pound of raw material were used. 17,579 labor hours were worked at an average rate of $19.5 per hour $35,411 actual variable overhead costs were incurred. Required: Caiculate each of the following variances. Note: Do not round intermediate calculations. Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)