Hollowell Audio. Inc.. manufactures military-specification compact discs. The company uses standards to control its costs. The labor standards that have been set for one disc are as follows: During July, 8.460 hours of direct labor time were required to make 19.400 discs. The direct labor cost totaled $52,452 for the month. Required: According to the standards, what direct labor cost should have been incurred to make the 19.400 discs? By how much does this differ from the cost that was incurred? (Do not round intermediate calculations.) Break down the difference in cost from (1) above into a labor rate variance and a labor efficiency variance. (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).) The budgeted variable manufacturing overhead rate is $4.7 per direct labor-hour. During July, the company incurred $42,300 in variable manufacturing overhead cost. Compute the variable overhead rate and efficiency variances for the month. (Do not round intermediate calculations. Round your final answers to the nearest dollar amount. Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance).)