The price of a stock decreased by 60 cents one week, decreased 10 cents the next week, and decreased another 20 cents the following week. What is the average change in the price of the stock over the three weeks?

Add the three weekly changes: −60 + (−10) + (−20) = −90 cents. Divide by 3 weeks: −90 ÷ 3 = −30 cents per week. The average change is −30 cents per week, which is choice D.

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