3. For manufacturing overhead, compute the following: a. The variable overhead spending and efficiency variances for the year. (Indicate the effect of each varlance by selecting "F" for favourable, "U" for unfavourable, and "None" for no effect (I.e., zero varlance). Leave no cells blank - be certain to enter "0" wherever required. Input all amounts as positive values. Omit the "$" sign In your response.) Variable overhead spending variance 1380 U S Variable overhead efficiency variance 6440 U b. The fixed overhead budget and volume variances for the year. (Indicate the effect of each variance by selecting "F" for favourable, "U" for unfavourable, and "None" for no effect (I.e., zero variance).Leave no cells blank - be certain to enter "0" wherever required. Input all amounts as positive values. Omit the "$" sign In your response.) Fixed overhead budget variance 110550 U $ Fixed overhead volume variance 103600 F