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To determine the percentage increase, we can use the following formula:

\[
\text{Percentage Increase} = \left(\frac{\text{New Value} - \text{Old Value}}{\text{Old Value}}\right) \times 100
\]

Given:
- Old Value = £150
- New Value = £180

Substitute these values:

\[
\text{Percentage Increase} = \left(\frac{180 - 150}{150}\right) \times 100
= \left(\frac{30}{150}\right) \times 100
= 0.2 \times 100 = 20\%
\]

So, the correct answer is **20%**.

Would you like a further breakdown, or do you have other related questions?

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Here are five follow-up questions that might help:
1. How do you calculate a percentage decrease?
2. What is the general formula for percentage change?
3. How would the calculation change if the values were given in dollars instead?
4. What happens if the stock's value decreases? How would the formula apply?
5. Can percentage increases exceed 100%? If yes, under what circumstances?

**Tip:** Always check the units when calculating percentage increases to avoid confusion with currencies or measurements.

A stock's value increased from £150 to £180. What is the percentage increase?

Learn how to calculate the percentage increase when a stock's value rises from £150 to £180. This example uses basic arithmetic to determine the percentage change, a common math concept for students in Grades 6-8.

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