Holly buys a hot dog stall for 360. In addition, she has to pay a fixed charge of 200 to the local council to secure her pitch. She plans to sell her hot dogs at 1 each and the cost of preparing each one is 0.60. (a) How many hot dogs will she need to sell to break even? (b) She finds a supplier that can provide cheaper hot dog sausages, enabling her to save 10 p per hot dog on the preparation cost. What effect does this have on the break-even point?