DASH Airlines is considering the addition of a flight from Red Cloud to David City. The total cost of the flight would be $1,100, of which $800 are fixed costs already incurred. Expected revenues from the flight are $600. DASH should: Group of answer choices not add this flight because total costs exceed total revenue. not add this flight because it is not profitable at the margin. not add this flight because only flights which cover their full costs are profitable. add this flight because marginal revenue exceeds marginal costs.