Exercise 21-20 (Algo) Controllable variance LO P4 Kenshaw Company's flexible overhead budget at an activity level of 1,000 units shows $10,700 in variable overhead costs and $5,700 in fixed overhead costs. Actual total overhead is $13,700. Compute the controllable variance. (Indicate the effect of the varlance by selecting favorable, unfavorable, or no varlance.) Controllable Variance Actual total overhead Budgeted (flexible) overhead at units produced Controllable variance