E11.21 (L9_2) Vincent Company uses flexible budgets to control its selling expenses. Monthly sales are expected to range from $170,000 to $200,000. Variable costs and their percentage relationship to sales are as follows: sales commissions 6%; advertising 4%; travelling 3%; and delivery 2%. Fixed selling expenses consist of sales salaries $35,000; depreciation on delivery equipment $7,000; and insurance on delivery equipment $1,000. Prepare a exible selling expenses budget. (m Instructions Prepare a monthly flexible budget for each $10,000 increment of sales within the relevant range for the year ending December 31, 2020