The Steam Company manufactures a product that is expected to incur $ $20$ per unit in variable production costs and sell for $ $50$ per unit. The sales commission is $15\%$ of the sales price. Due to intense$$ competition, Steam Company actually sold $200$ units for $ $40$ per unit. The actual variable production costs incurred were $ $25\mathrm{.}00$ per unit. Calculate the total contribution margin and contribution margin ratio at the expected$$ price$/$costs and the actual$$ price$/$costs$.$ How might management use this$$ information?