A shopkeeper sold a table at a profit of 20% and a chair at a profit of 25%. If the cost price of the chair is equal to the selling price of the table and the shopkeeper's total profit is Rs. 400, what is the combined selling price of both items?

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**Solution:**

1. Let the cost price of the table be $100a$.

2. Since the table is sold at a 20% profit, its selling price is:
   $$100a \times \frac{120}{100} = 120a$$

3. Given that the cost price of the chair equals the selling price of the table, the cost price of the chair is:
   $$120a$$

4. The chair is sold at a 25% profit, so its selling price is:
   $$120a \times \frac{125}{100} = 150a$$

5. The total profit earned is Rs. 400, so:
   $$(\text{Total Selling Price}) - (\text{Total Cost Price}) = 400$$
   $$(120a + 150a) - (100a + 120a) = 400$$
   $$270a - 220a = 400$$
   $$50a = 400$$
   $$a = 8$$

6. The combined selling price of both items is:
   $$120a + 150a = 270a = 270 \times 8 = 2160 \text{ Rs.}$$

**Answer:** Rs. 2160

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