Philp Neilson owns a fireworks store, Philip's fixed costs are $13,500 a month, and each fireworks assortment he sells costs, on average, $12. The average selling price for an assortment is $40. a. The break-even point for Philip's fseworks store is units. (Enter your rosponse rounded up to the next wholo numbec) b. Suppose Philip decides to expand his business. His new focod expenses will be $22,500, but the average cost for a freworks assortment wal fal to just $7 due to Philp's higher purchase volumbs. The new break-even point is unis. (Enter your response rounded op to the next whole numbec.) c. At what volume level is Philip indillerent to the two capacily attemabes outlined above? Philip's indilference point is anits. (Enter your response raunded to the nearest whole number.)