A shopkeeper give 20% discount on a article and sold it with a profit of 25%. Find cost price in Rs. if selling price is 640rs?Options512602286426

To solve this problem, we need to understand that the selling price is the result of the cost price plus the profit minus the discount.

Step 1: We know that the selling price after a 25% profit is 640 Rs. So, we can calculate the cost price before the profit by dividing the selling price by 1.25 (since 25% profit means the selling price is 125% of the cost price).

640 / 1.25 = 512 Rs.

Step 2: But this is the price after the shopkeeper gave a 20% discount. So, this price is 80% of the original price. We can find the original price by dividing this price by 0.8.

512 / 0.8 = 640 Rs.

So, the original cost price of the article was 640 Rs.

Therefore, the correct option is 640.