2. Compute the labor rate and efficiency variances for August. (Input al amounts as positive values.Indicate the offect of each varlance by selecting "F" for favorable, U" for unfavorable, and "None" for no effect (Le, zero variance).) Labor rate variance Labor efficiency variance 3. Compute the variable overhead rate and efficiency variances for August. (Input all amounts as positive values, Indicate the offect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (ie, zero variance).) Variable overhead rate variance Variable overhead efficiency variance