4. (40 points) Reynolds Company has the following information pertaining to its selling expenses: Sales commissions Sales manager's salary Advertising expense Shipping expense Miscellaneous selling expense 12% of sales $140,000 per month $110,000 per month 3% of sales $7,000 per month plus 2% of sales Required: a. Prepare a flexible budget assuming sales equal to $200,000 and $400,000. b. Using the high-low method, write the formula for total selling expenses in the following format: Total selling expenses - a+ b (Sales in dollars)