Sales commissions Advertising expense Miscellaneous administrative expense 14% of sales 20% of sales $6,000 per month plus 12% of sales $29,000 per month $13,000 per month plus 20% of sales $30,000 per month Office salaries expense Customer support expenses Research and development expense Prepare a flexible selling and administrative expenses budget for October for sales volumes of $400,000, $500,000, and $600,000. (Use Exhibit 5 Digital Solutions Inc. Flexible Selling and Administrative Expenses Budget For the Month Ending October 31 Total sales $400,000 $500,000 $600,000 Variable cost: Total variable cost Fixed cost: Total fixed cost Total selling and administrative expenses