Derr Company reports the following. Compute (a) controllable variance, (b) volume variance, and (c) total overhead variance. Actual total overhead $ 1, 020 Budgeted (flexible) overhead at units produced 800 Standard overhead applied 940 Complete this question by entering your answers in the tabs below. Required 1 Required 2 Required 3 Compute controllable variance. Note: Indicate the effect of the variance by selecting favorable, unfavorable, or no variance. Controllable Variance Controllable variance Compute total overhead variance. Note: Indicate the effect of the variance by selecting favorable, unfavorable, or no variance. Total Overhead Variance Overhead variance Required 2 Required 3 >