Products pass successively through the hands of three traders and each of them sells his goods at a profit of 30\% of his cost price. If the last trader sold the products for Rs. 300, then how much did the first trader pay for them?

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**Solution:**

1. Let the cost prices of the first, second, and third traders be $C_1$, $C_2$, and $C_3$ respectively.

2. Each trader sells at a profit of 30\%, so the selling price $S$ for each trader is:
   $$S = 1.30 	imes C$$

3. The last trader sold the product for Rs. 300, so:
   $$S_3 = 1.30 	imes C_3 = 300$$
   $$C_3 = \frac{300}{1.30} \approx 230.77$$

4. The selling price of the second trader is the cost price of the third trader:
   $$S_2 = 1.30 	imes C_2 = C_3 = 230.77$$
   $$C_2 = \frac{230.77}{1.30} \approx 177.51$$

5. The selling price of the first trader is the cost price of the second trader:
   $$S_1 = 1.30 	imes C_1 = C_2 = 177.51$$
   $$C_1 = \frac{177.51}{1.30} \approx 136.55$$

**Answer:** The first trader paid approximately Rs. 136.55 for the products.

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