Discussion
Salary (in thousands) of Deepak for the given period are shown in graph:-
By what percentage has Deepak’s salary decreased in 2013 over 2010?
Answer: B
The salary fell by 25%.
Reading the graph, Deepak's salary was 20 thousand in 2010 and 15 thousand in 2013, a fall of 5 thousand.
\[ \begin{aligned} \text{decrease} &= \frac{20 - 15}{20} \times 100 \\ &= 25\% \end{aligned} \]
The base of a percentage change is the earlier value, 2010's 20 thousand.
33.33% is what you get by dividing the fall by the 2013 value, 15, instead of 20. 20% would be the fall from 2011 to 2012 (25 to 20). 'None of these' is wrong because 25% is offered.
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