Marie Yang
11/22/09
Missing Money
They get $50 back and and they give $20 for tip and they get $30 for each. When calculate how much money did they spend, the thought they lose $10. But $250+30+20=300. In $90 it's include tip.
Each person spend $90. So 90*3=270. They spend $250 for room. 270-250=20 and 20 is for worker.
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