During May, Joliet Fabrics Corporation manufactured 680 units of a special multilayer fabric with the trade name Stylex. The following information from the Stylex production department also pertains to May. The standard prime costs for one unit of Stylex are as follows: Required: Compute the following variances for the month of May. (Indicate the effect of each variance by selecting "Favorable" or "Unfavorable". Select "None" and enter "O" for no effect (i.e., zero variance)