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 ?
A. 120%
B. 400%
C. 80%
D. 100%
Answer: Option B
Solution(By Examveda Team)
Decrease in sale = 80% from 2008 to 2009Now, sales of 2010 are same as in 2008
:. Increase in sales
$$\eqalign{ & = \left[ {\frac{{100 \times {\text{a}}}}{{100 - {\text{a}}}}} \right]\% \cr & = \left[ {\frac{{100 \times 80}}{{100 - 80}}} \right]\% \,\,\,\left[ {{\text{a}} = 80\% } \right] \cr & = \frac{{8000}}{{20}}\% \cr & = 400\% \cr} $$
Related Questions on Profit and Loss
A. 45 : 56
B. 45 : 51
C. 47 : 56
D. 47 : 51
A. Rs. 2600
B. Rs. 2700
C. Rs. 2800
D. Rs. 3000
A. A neither losses nor gains
B. A makes a profit of 11%
C. A makes a profit of 20%
D. B loses 20%
A. Rs. 3,750
B. Rs. 3,250
C. Rs. 2,750
D. Rs. 2,250
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