Prepare amonthly flexible selling expense budget for Prater Company for sales volumes of $250,000, $440,000, and $770,000, based on thefollowing data:
| Sales commissions | 5% of sales | 
| Sales manager's salary | $100,000 per month | 
| Advertising expense | $ 95,000 per month | 
| Shipping expense | 2% of sales | 
| Miscellaneous selling expense | $2,100 per month plus 3/4% of sales |