Mathematics, 24.06.2019 21:00 mendezmarco2004

In 1990, people in the united states spent $52.9 billion on video and audio products. in 2000, people spent $106.9 billion on video and audio products. what was the rate of change? a. $54 billion per year b. $5.4 billion per year c. $540 billion per year d. $54 million per year

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