Sales commissions 5% of sales Advertising expense 12% of sales Miscellaneous selling expense $2,000 plus 3% of sales Office salaries expense $8,000 per month Office supplies expense 2% of sales Miscellaneous administrative expense $500 per month plus 1% of sales Instructions: Prepare a flexible selling and administrative expenses budget for May 2011, for sales volumes of $120,000, $160,000, and $200,000