Affordable Electronics Inc. manufactures medium-quality, reasonably priced wireless speakers for home use. The company uses standards to control its costs. The labour standards that have been set for one speaker are as follows: During July, 8,050 hours of direct labour time were recorded to make 26,000 units. The direct labour cost totalled $132,020 for the month. 3. The budgeted variable manufacturing overhead rate is $3.00 per direct labour-hour. During July, the company incurred $24,955 in variable manufacturing overhead cost. Compute the variable overhead spending and efficiency variances for the month, (Indicate the effect of each variance by selecting "F" for favourable, " U " for unfavourable, and "None" for no effect (i.e., zero variance).)