A total of 16 million cars were sold in China in 2010; in 2008 the sale was 6.6

Question

A total of 16 million cars were sold in China in 2010; in 2008 the sale was 6.6 million. What is the annual growth rate of car sales, expressed as % per year? If there were 16. million cars already on Chinese roads by the end of 2010 and this growth rate continues, how many cars will there be in 2020, assuming that the number that are removed from the roads in this time interval can be neglected? Global water consumption has tripled in the last 50 years. What is the growth rate, 1% in consumption, C, assuming exponential growth? By what factor will water consumption increase between now (2012) and 2050? : Prove the statement made inthe text that "at a global growth rate of just 3% per year we will mine, process, and dispose of more stuff in the next 25 years than in the entire 300 years since the start of the industrial revolution.

Explanation / Answer

Growth Rate = (Increase in the Car sales/Old Car Sales) *100/2

(9.4/6.6)*100 = 142. 42/2 = 71.21% growth rate per annum .

By 2020, we'll have (4.8*10) + 16 = 64 million cars

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