Finance Use the accompanying graph to answer Exercise. Explain how you obtained your answe...

Finance Use the accompanying graph to answer Exercise. Explain how you obtained your answer from the graph, which shows the annual percent change in various consumer price indexes (CPIs). (See Examples 10 and 11.)

Source: U.S. Census Bureau.

(a) When was the energy CPI decreasing at the fastest rate?

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(b) When was the energy CPI increasing at the fastest rate?

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(c) Was there ever a time after 2000 when the medical-care CPI and the energy CPI were increasing at the same rate? How can you tell from the graph?