You have been hired by FAB Corporation, a manufacturer of a new garage door opening device. The President has asked you to review the company's costing system to control manufacturing overhead costs. The company has never used a flexible budget, so you suggest that preparing this kind of budget would be the first step in planning for manufacturing overhead costs. You have determined the following cost formulas and gathered the following cost date for March: ! During March, the company worked 26,000 machine hours and produced 15,00 units. The company had originally planned to work 30,000 machine-hours during March. Required a) Calculate the activity variances for March. b) Calculate the spending variances for March