In 1984, a school bus costs $20,000. To answer each of the parts below, assume that the customer price index (CPI) was 36.8 in 1970, 100 in 1984, and 140.7 in 1992. Part I: If the price of a school b

In 1984, a school bus costs $20,000. To answer each of the parts below, assume that the customer price index (CPI) was 36.8 in 1970, 100 in 1984, and 140.7 in 1992.

Part I: If the price of a school bus increased at the same rate as the CPI from 1970 to 1984, how much did a school bus cost in 1970? By how much did the price of a school bus increase from 1979 to 1984?

Part II: If the price of a school bus increased at the aamw rate as the CPI from 1984 to 1992, how much did a school bus cost in 1992? By how much did the price of a school bus increase from 1984 to 1992?

Part III: If a school bus cost $4,100 in 1950, and the price of a school bus increased at the same rate as the CPI from 1950 to 1984, what was the CPI to the nearest tenth in 1950?

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