To calculate Ivy's new salary after an 18.5% pay increase, follow these steps:

1. Find the amount of the pay increase: $\text{Pay increase} = \frac{18.5}{100} \times 3150 = 0.185 \times 3150 = 582.75$
2. Add the pay increase to Ivy’s current salary: $\text{New salary} = 3150 + 582.75 = 3732.75$

So, after the 18.5% increase, Ivy will earn £3732.75 per month.

Would you like a detailed explanation of any steps, or do you have further questions on this topic?

Here are some related questions:

1. How do you calculate a percentage increase or decrease in general?
2. What would be the new salary if the pay increase was 10% instead of 18.5%?
3. How can you calculate the total salary after multiple percentage increases?
4. What’s the difference between a percentage increase and a flat increase?
5. How do you calculate the percentage of an amount?

Tip: When calculating percentage increases or decreases, always convert the percentage to a decimal before multiplying by the original amount.