In 2009 Electric Bike Sales In China Totaled 210 Million

In 2009, electric bike sales in China totaled 21.0 million. Sales are estimated to rise to 25.0 million by 2012. Find the average rate of change in sales of electric bikes in China from 2009 to 2012.
In 2009, electric bike sales in China totaled 21.0 million.

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