a restaurant owner who wants to sell T-shirts advertising his brand. He recalls that there is a fixed cost and variable cost, although he does not remember the values. He does know that the T-shirt printing company charges $440 for 20 shirts and $1000 for 100 shirts. Question: a. Find the equation C = f(x) that describes the total cost as a function of number of shirts b. determine how many shirts he must sell to break even if he sells the shirts for $10 each.