he activity variances in column I are influenced by two cost driversnumber of productions and number of performances. Therefore: a. In cell I21 create a formula that quantifies the portion of the overall activity variance that is caused solely by the fact that The Munchkin Theatre actually put on four productions instead of the planned number of five productions. What is the amount in cell I21? b. In cell I22 create a formula that quantifies the portion of the overall activity variance that is caused solely by the fact that The Munchkin Theatre actually put on 64 performances instead of the planned number of 60 performances. What is the amount in cell I22? c. Create IF-THEN statements in cells J21 and J22 that properly label your variances in cells I21 and I22 as favorable (F) or unfavorable (U).