The company earning the maximum percentage of profit in the year 2001 is:

Answer: Option A

$$\begin{array}{rl}& \text{From bar diagram}\\ & \text{Profit percent of company Q}\\ & =\frac{40-30}{30}\times 100\\ & =\frac{100}{3}\\ & =33\frac{1}{3}\%\end{array}$$