Tashu sold an article to Mahi at a profit of 30%. Mahi then sold the same article to Jony at a loss of 10%. Finally, Jony sold the article to Khushi for Rs. 2691, making a profit of 15%. What was the original cost price of the article for Tashu?

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**Solution:**

1. Let the cost price of the article for Tashu be *x*.

2. Tashu sells it to Mahi at a 30% profit, so Mahi's cost price =
   $$x + 30\% 	ext{ of } x = x 	imes \left(1 + \frac{30}{100}ight) = 1.3x$$

3. Mahi sells it to Jony at a 10% loss, so Jony's cost price =
   $$1.3x - 10\% 	ext{ of } 1.3x = 1.3x 	imes \left(1 - \frac{10}{100}ight) = 1.3x 	imes 0.9 = 1.17x$$

4. Jony sells it to Khushi at a 15% profit for Rs. 2691, so
   $$	ext{Selling price} = 1.17x 	imes \left(1 + \frac{15}{100}ight) = 1.17x 	imes 1.15 = 1.3455x$$

5. Given selling price = Rs. 2691, so
   $$1.3455x = 2691$$

6. Solving for *x*:
   $$x = \frac{2691}{1.3455} \approx 2000$$

**Answer:** Rs. 2,000

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