Johnson Service Company uses flexible budgets that are based on the following data: Sales Commissions 14% of sales Advertising Expense 15% of sales Miscellaneous Administrative Expense $7,000 per month plus 8% of sales Office salaries expense $28,000 per month Customer support expenses $12,000 per month plus 20% of sales commissions Research and Development expenses $30,000 per month Prepare a flexible selling and administrative expenses budget for April for sales volumes of $400,000, $500,000, and $700,000