The correct option is D Q
The percentage profit/loss in the year 2001 for various companies are:
For M =[(35−45)45×100]% = -22.22% i.e., Loss = 22.22%
For N =[(50−40)40×100]% = 25% i.e., Profit = 25%
For P =[(40−45)45×100]% = -11.11% i.e., Loss = 11.11%
For Q =[(40−30)30×100]% = 33.33% i.e., Profit = 33.33%
For R =[(50−45)45×100]% = -11.11% i.e., Profit = 11.11%
Clearly, the Company Q earned the maximum profit in 2001.