Explanation:

- Swati sold the bag to Ankita at a gain of 15%.

This means that Swati sold the bag for 115% of her purchase price.

- Ankita then sold the bag to Aashi for Rs. 24,840, with a profit of 20%.

This means Ankita's selling price to Aashi = 120% of Ankita's cost price.

- Let's calculate Ankita's cost price:

Ankita’s selling price (24,840) is 120% of her cost price.

So, Ankita’s cost price = 24,840 / 1.20 = Rs. 20,700.

- Swati sold the bag to Ankita at a 15% gain.

Therefore, Swati’s selling price (Ankita's cost price of Rs. 20,700) is 115% of Swati’s cost price.

- Swati’s cost price = 20,700 / 1.15 = Rs. 18,000.

- Option 2: Rs. 18,000 is the correct price at which Swati bought the bag.

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