https://hamchoigame.com/which-the-apples-were-bought-15-the-cost-price-of-16-pens-is-equal-to-the-selling-price-of-12-pens-find-the-gain-or-loss-per-cent
Which the apples were bought 15 the cost price of 16 pens is equal to the selling price of 12 pens find the gain or loss per cent?