please help, i will give thumbs up. thanks.

Concord Company uses flexible budgets to control its selling expenises. Monthly sales are expected to range from $193,800 to $228.000. Variable costs and their percentage relationship to sales are sales commissions 8%, advertising 4%, travel 3%, and delivery 2%. Fixed selling expenses will consist of sales salaries $39,900, depreciation on delivery equipment $7,980, and insurance on delivery equipment $1,140. Prepare a monthly selling expense flexible budget for each $11,400 increment of sales within the relevant range for the year ending December 31, 2022. (List variable costs before fixed costs)