Some toffees are bought at the rate of 11 for Rs 10 and the same number at the rate of 9 for Rs 10. If the whole lot is sold at one rupee per toffee, find the gain or loss percent on the whole transaction.

Explanation

To solve the problem step by step, we will follow these calculations:

### Step 1: Determine the number of toffees bought
Let’s assume we buy **X** toffees at each rate.

- For the first lot, we buy **11 toffees for Rs. 10**. Therefore, the cost per toffee is:
\[
\text{Cost per toffee} = \frac{10}{11} \text{ Rs}
...