On the first day of school, the school store had 100 pencils for sale at $1 each. at the end of the week, there were 90 pencils left. the second week, the price of pencils dropped to $.75 each. at the end of the week, there were 75 pencils left. the store dropped the price $.25 each week, and at the end of the fourth week, there were no pencils left. which price was the market clearing price?

Juanita and sam attend a beach party and notice that the local beach appears to have a great deal more trash washed up on shore than it did when they were young. the water doesn't appear nearly as clear, and there seems to be less evidence of small water creatures living in the shallows. an afternoon at the local library convinces them that one major cause is the new factory nearby. after some discussion, they decide their next step should be identifying the cause of the changes identifying the problem picketing the guilty factory lobbying their elected representatives to complain about the problem talking to a local environmental group about solutions