What is the key factor in determining sales mix if a company has limited resources? Total contribution margin The amount of fixed costs per unit Contribution margin per unit of limited resource The cost of limited resources

Some years ago it was estimated that the demand for steel approximately satisfied the equation p=194-25x x, and the total cost of producing x units of steel was upper c left parenthesis x right parenthesis equals 145 plus 40 x. (the quantity x was measured in millions of tons and the price and total cost were measured in millions of dollars.) determine the level of production and the corresponding price that maximize the profits.