The number of projects handled by company B decreased by what percent from 2004 to 2006?

Answer: Option E

Number of projects handled by company B in 2004 = 320
Number of projects handled by company B in 2006 = 190
Required decrease percentage
$$\begin{array}{rl}& =\frac{320-190}{320}\times 100\\ & =\frac{130}{320}\times 100\\ & =\frac{1300}{32}\%\\ & =\frac{325}{8}\%\\ & =40\frac{5}{8}\%\end{array}$$