Profit with Multiple Shares

If we bought 1 share for 1 rupee, and then sell it for 2 rupees, our profit will be 2 - 1 = 1 rupee. If we buy 2 shares for 1 rupee each, and then sell them for 2 rupees each, we will now make a profit of (2 - 1) + (2 - 1) = 2 rupees.