text: seller buys at 2for a rs.,sells at 5 for 3rs. what ishis gain percent? a fruit seller buys lemons at 2 for a rupee and sells them at 5 for 3 rupees.what is his gain percent i buy 10, costing 5 rs. i sell 10, gaining 6 rs.  gain % = (6-5)/5 * 100%.  gain = 20%.