9. Answer the following questions: What is the total revenue/spending variance for operating income? $_-4653 F or U? b. What is the Activity variance for operating income? $ 22615 F or U? c. Does the combination of the revenue/spending variance and activity variance sum to the master budget variance for operating income? Y or N? Should it always sum to the master budget variance? Y or N? d. How much of the master budget variance for Sales revenue was caused by an unanticipated increase in volume? F or U? e. How much of the master budget variance for Commissions Exp. was caused by an unantici- pated increase in volume? F or U? f. How much of the master budget variance for Advertising Expenses was caused by an unan- ticipated increase in volume? F or U?