The net change in the company's stock price over the four days is $-0.30.

Would you like more details or have any questions?

Here are 5 additional questions you can ask:

1. How do you calculate the net change over a period?
2. What is the significance of a negative net change in stock price?
3. Can you show how to represent these changes graphically?
4. How do you interpret daily fluctuations in stock prices?
5. What are some factors that can cause such fluctuations in stock prices?

Tip: When working with changes in values, always pay attention to the signs (positive or negative) to ensure accurate calculations.