The line graph below shows the number of laptops sold by Hemant over five days for two brands: HP and Dell.
![image.png](https://res.cloudinary.com/aptidude/image/upload/v1757396073/aptidude_questions/adaov33zta6yhedwvwls.png)
Calculate the percentage by which the total number of laptops sold on Tuesday is more or less than the total sold on Monday.

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**Solution:**

1. From the graph, note the number of laptops sold on Monday and Tuesday for both HP and Dell.

- Let the total laptops sold on Monday be $M = HP_{Mon} + Dell_{Mon}$.

- Let the total laptops sold on Tuesday be $T = HP_{Tue} + Dell_{Tue}$.

2. Calculate the difference between Tuesday's and Monday's sales:

$$\text{Difference} = T - M$$

3. Find the percentage increase or decrease using the formula:

$$\text{Percentage change} = \frac{T - M}{M} \times 100\%$$

4. According to the graph data, Tuesday's total sales are 40\% more than Monday's total sales.

**Answer:** 40\%

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