A girl buys lemons at 4 for Rs 3 and sells them at 5 for Rs 4. How much percent loss or gain does she make?

Explanation

To solve the problem of how much percent loss or gain the girl makes when buying and selling lemons, we can follow these steps:

### Step 1: Calculate the Cost Price (CP) of 1 Lemon
The girl buys 4 lemons for Rs 3. To find the cost price of one lemon, we can use the formula:

\[ \text{Cost Price of 1 Lemon} = \frac{\text{Total Cost}}{\text{Number of Lemons}} = \frac{3}{4} = 0.75 \text{ Rs} \]
...