\begin{tabular}{l|l|l} Required A & Required B & Required C \end{tabular} Compute the variable overhead spending and efficiency variances. Note: Indicate the effect of each variance by selecting favorable, unfavorable, or no variance. Round "cost per unit" and "rate per hour" answers to 2 decimal places. Compute the total controllable variance. Note: Indicate the effect of each variance by selecting favorable, unfavorable, or no variance