12. brad sells ice cream and soft drinks at outdoor festivals. he buys soft drinks for 50 cents per can and ice cream bars for $75 per hundred. he marks up all items by 100 percent selling the drinks for $1.00 and ice cream bars for $1.50. one day he sold 100 cans of soft drinks and 90 ice cream bars. his expenses totaled $31.50. what was his net profit?