Explanations:To solve this problem, we need to understand the concept of calculating the price of a single unit and then applying a discount to that unit price. The question states that 2 plates of aloo ke gutke are served at Rs 600. Therefore, the price of one plate is calculated as follows:
Price of one plate = Total price / Number of plates
Price of one plate = 600 / 2
Price of one plate = 300 rupees
Next, we need to apply a 20% discount to the price of one plate. The formula for calculating the discounted price is:
Discounted Price = Original Price - (Original Price * Discount Percentage)
Substituting the values, we get:
Discounted Price = 300 - (300 * 20 / 100)
Discounted Price = 300 - (300 * 0.20)
Discounted Price = 300 - 60
Discounted Price = 240 rupees
Therefore, the person should pay 240 rupees for one plate with a 20% discount.
It is important to note that the discount is applied to the price of one plate, not the total price of two plates. This is a common mistake that students might make, leading them to calculate the discount on the total price of 600 rupees instead of the unit price of 300 rupees.
Understanding the concept of unit price and applying discounts correctly is crucial for solving such problems. The key steps are to first determine the price of a single unit and then apply the discount to that unit price.