英语数学
fortypeopleeachbought$2lotterytickets.threeofthesepeoplewon$5,twoofthemwon$10,andoneo...
forty people each bought $2 lottery tickets. three of these people won $5,two of them won $10,and one of them won $20. the total amount of money won is what percent of the total amount spent on the tickets?
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