Satish bought 35 notebooks for ₹700 and sold 28 of them for ₹600. Find his percentage gain.

$7\frac{1}{7}$% $9\frac{1}{7}$% $6\frac{1}{7}$% $8\frac{1}{7}$%

$7\frac{1}{7}$%

Cost price of 35 notebooks = 700 So, CP of 1 notebook = 20 Selling price of 28 notebooks = 600 So, Selling price of 1 notebook = \(\frac{600}{28}\) = \(\frac{150}{7}\) Profit = \(\frac{150}{7}\) - 20 = \(\frac{10}{7}\) Profit% = \(\frac{\frac{10}{7}}{20}\) × 100 = $7\frac{1}{7}$%