The standard cost sheet for Chambers Company, which manufactures one product, follows: Standards have been computed based on a master budget activity level of 30,100 direct labor-hours per month. Actual activity for the past month was as follows: 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.)