Questions 4-6 refer to the following data.The average annual cost to attend a private university increased at a constant rate from 1995 to 2000, and 2.5 million students attended private universities in 1998. If 2 million students attended private universities in 1990, then by approximately what percent did the total dollar amount spent on private universities increase from 1990 to 1998?

1. 25%


2. 30%


3. 55%


4. 70%


5. 90%

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AVERAGE ANNUAL UNIVERSITY COSTS* 1980 1975 1905 1990 1985 2000 $0 $5,000 $10,000 $15,000 "Includes tuition, fees, room, and board Public Private $20,000 $25,000 $30,000 $35,000