The standard cost sheet for Chambers Company, which manufactures one product, follows: Direct materials, 30 yards at $4.00 per yard $ 120 Direct labor, 4 hours at $25 per hour 100 Factory overhead applied at 80% of direct labor 80 (variable costs = $70; fixed costs = $10) Variable selling and administrative 70 Fixed selling and administrative 46 Total unit costs $ 416 Standards have been computed based on a master budget activity level of 29,400 direct labor-hours per month. Actual activity for the past month was as follows: Materials used 234,000 yards at $4.10 per yard Direct labor 30,000 hours at $27.00 per hour Total factory overhead $ 620,000 Production 7,200 units Required: Prepare variance analyses for the variable and fixed costs. Materials are purchased as they are used. (Do not round intermediate calculations. Indicate the effect of each variance by selecting "F" for favorable, or "U" for unfavorable. If there is no effect, do not select either option.)