Question 767982: can you help me with this problem
China is one of the biggest potential markets for US autos. In 2010, there were 1.38E8 car owners in China and the number was growing with a doubling time of 6.3 years. How many car owners would you predict for that country in 2020? Owners (E notation, 2 decimals)??
Answer by josmiceli(19441)   (Show Source):
You can put this solution on YOUR website! For now, say there are  car owners in China in 2010
Also, for now, say the number doubles every  years
Let  = current number of car owners
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After years, there are:
After  years, there are
After  years, there are
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So, the general formula would be
 where k*t is the years
since 2010
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From 2010 to 2020 is  years, so
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In 2020, there will be:
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I can't find my calculator, but you need to convert
 to a number that looks like a.aaa x 10^n
Then multiply by 
Then get it back to looking like a.aaa x 10^n
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