Let's break down the problem:

Jane earns £1500 a month and saves £225 each month. We are asked to find what percentage of her monthly salary she saves.

To calculate the percentage, use the formula:

$\text{Percentage saved} = \left( \frac{\text{Amount saved}}{\text{Total earnings}} \right) \times 100$

Substituting the given values:

$\text{Percentage saved} = \left( \frac{225}{1500} \right) \times 100 = 0.15 \times 100 = 15\%$

So, Jane saves 15% of her monthly salary.

Would you like further explanation or clarification? Here are some related questions to explore:

1. How would the percentage change if Jane saved more or less each month?
2. What happens if Jane earns a different monthly salary, say £2000, and still saves £225?
3. How long would it take Jane to save enough money to buy the computer?
4. If Jane saves a higher percentage, how would this affect her ability to buy the computer?
5. How would you calculate Jane’s savings if she saved a fixed amount but her salary fluctuated?

Tip: To calculate any percentage of a number, multiply the number by the percentage (in decimal form) and divide by 100.