In a sale, all the prices are reduced by 25%. In the second week of the sale, the prices are reduced by 25% of the previous week’s price. In the third week of the sale, the prices are again reduced by 25% of the previous week’s price. In the fourth week of the sale, the prices are again reduced by 25% of the previous week’s price. Vanellope thinks this will mean that the prices will be reduced to ₱0 after the four reductions because 4 x 25% = 100%. Explain why Vanellope is wrong.