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1. Study the following bar-graph carefully and answer the questions given below:

In which year was there maximum percentage increase in export of pearls to that in the previous year?

A. 2002

B. 2007

C. 2005

D. 2004

Solution:

\begin{aligned} Increase % in various years \\ 2002 \to {\frac{(6.5 - 5.2)}{5.2} \times 100} % \\ = (\frac{1.3}{5.2} \times 100) % \\ = (\frac{13}{52} \times 100) % \\ = 25 % \\ 2003 \to {\frac{(7.8 - 6.5)}{6.5} \times 100} % \\ = (\frac{1.3}{6.5} \times 100) % \\ = (\frac{13}{65} \times 100) % \\ = 20 % \\ 2004 \to {\frac{(9.9 - 7.8)}{7.8} \times 100} % \\ = (\frac{2.1}{7.8} \times 100) % \\ = (\frac{21}{78} \times 100) % \\ = 26.9 % \\ 2005 \to {\frac{(10.8 - 9.9)}{9.9} \times 100} % \\ = (\frac{0.9}{9.9} \times 100) % \\ = (\frac{9}{99} \times 100) % \\ = \frac{100}{11} % \\ = 9.090 % \\ 2007 \to {\frac{(11.4 - 9.5)}{9.5} \times 100} % \\ = (\frac{1.9}{9.5} \times 100) % \\ = (\frac{19}{95} \times 100) % \\ = 20 % \end{aligned}

Clearly, the maximum increase was in 2004

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