Task: The following information is available for Brownstone Products Company for the month of July
| 
   
 | 
 Actual 
 | 
 Master Budget 
 | 
| 
 Units 
 | 
 3,800 
 | 
 4,000 
 | 
| 
 Sales revenue 
 | 
 $53,200 
 | 
 $60,000 
 | 
| 
 Variable manufacturing costs 
 | 
 19,000 
 | 
 16,000 
 | 
| 
 Fixed manufacturing costs 
 | 
 16,000 
 | 
 15,000 
 | 
| 
 Variable selling and administrative   expenses 
 | 
 7,700 
 | 
 8,000 
 | 
| 
 Fixed selling and administrative   expenses 
 | 
 10,000 
 | 
 9,000 
 | 
Task 1.  Set up a spreadsheet to compute the July sales volume variance and the flexible-budget variance for the month in terms of both contribution margin and operating income
Task 2. Create an electronic spreadsheet that will allow the firm to prepare pro form a budgets for activities within the relevant range of operations and prepare flexible budgets when sales are:
a. 3,750 units
b. 4,150 units