Find the balance point in the following problems.    During a basketball game, the snack bar has put up a combo of chicken, fries, and soda for sale at a price of $ 4.75. The owner records that he has a production cost in the premises of yc = $ 2.25x + $ 690. a. Find the balance point. b. If it is known that at least 300 combos will be sold, what should the price be set to ensure there are no losses?