Mrs. Green was the manager of a larger company, and she frequently had to have meetings with other business people in a room in her building. She didn't smoke at all, but many of the other people at the meeting did, so she often found the air during the meeting terrible. One day, after an hour, her throat and eyes were sore and she was coughing a lot, so she called a big air-conditioning company and asked them to work how much it would cost keep the air of the meeting room in her building really clean.
After a few days the air-conditioning company sent in estimates for Mrs. Green to choose from. One estimate was for $5000 to put in new air-conditioning, and the other was for $5 for a sign which said "NO SMOKING"
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