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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 ?

Correct Answer: 400%
Decrease in sale = 80% from 2008 to 2009
Now, sales of 2010 are same as in 2008
:. Increase in sales
$$\eqalign{ & = \left\% \cr & = \left\% \,\,\,\left \cr & = \frac{{8000}}{{20}}\% \cr & = 400\% \cr} $$

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Subscription recieved in 2009 is
For the year 2008 ⇔ Rs. 1,300
For the year 2009 ⇔ Rs. 10,000
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Subscription outstanding on 31st December, 2009 ⇔ Rs. 700.
The amount of subscription to be posted to Income and Expenditure account of 2009 will be

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