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From 2008 to 2009, the sales of a book decreased by 80%. If the sales in 2010 were the same as in 2008, by what percent did it increase from 2009 to 2010?
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- 120%
- 400%
- 80%
- 100%
Correct Option: B
Let number of books sold in 2008 = 100
If sales of a book decreased by 80% , then
Number of books sold in 2009 = 20
Number of books sold in 2010 = 100
Increase = 100 - 20 = 80
| ∴ Required percentage increase = | × 100 | Number of books sold in 2009 |
| Required percentage increase = | × 100 = $ 400% | 20 |
