Hi,

Taking it a Step at a time:

1) Scientific Notaton is a 'shorthand' version expressing the number via a power of ten

$38,460,000, and the $27,980,000 is scientific notation

$38,460,000. = 3.846x10^7 (Note: deciamal point moved 7 units to left)

$27,980,000. = 2.798x10^7



Increase in sales from 2009 to 2010

3.846x10^7 -  2.798x10^7 = 1.048x10^7



 % of that increase of the 2009 sales

1.048x10^7/ 2.798x10^7 = .375 or 37.5% 

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