(c) Let the price of four notebooks before discountbe ₹ 100. Price of 1 notebook = ₹
100
4
= ₹ 25 Price of 5 notebooks = ₹ 25 x 5 = ₹ 125 But after discount the price of 4 notebooks is equalto the price of 5 notebook. So, it should be ₹ 100. Price of 1 notebook after discount = ₹