The return on equity is 242%.
How the return on equity is computed:
Purchase of Infosys Ltd. 200 shares at Rs. 10 = Rs. 2,000
Dividend received = 20% of Rs. 2,000 = Rs. 400
Sale of 200 shares at Rs. 250 = Rs. 50,000
Return on equity in dollars = Rs. 48,400 (Rs. 50,000 + Rs. 400 - Rs. 2,000)
Return on equity in percentages = 242% (Rs. 48,400/Rs. 2,000 x 100)