Electric Bicycle Sales. Worldwide electric bicycle sales, with 92% of the market in China,...

Electric Bicycle Sales. Worldwide electric bicycle sales, with 92% of the market in China, totaled $8.4 billion in 2013. By 2020, total sales are expected to reach $10.8 billion. (Source: “Electric Bicycle Sales Expected to Climb" by Catherine Green, Los Angeles Times, July 27, 2013) Find the expected average rate of change in worldwide sales of electric bicycles from 2013 to 2020.