Total costs equal total total costs equal total costs divided by outpul I = TClOl Average costs equal total variable costs divided by output. = TVCiO) Average costs equal total fixed costs divided by oulput? =TFCl cost equals the change in cost divided by the change in output ( =/Q, where the Greek letter , delta, means "change in") The marginal cost curve intersects the point of the average total cost curve and the point of the average variable cost curve..