Let's say you already have a resource with a field for the number of guests.
For example, an hourly resource with a price of $100 / hour.

Now, create a pricing component for the extra charge for each guest over 8.
Click **+**.

1. Enter a name for the component.

2. Enter the name of the formula parameter for the number of guests.
For example, GUESTS.

3. Enter the formula.
We multiply $100 by the number of guests over eight.
And all this is multiplied by [INTERVALS] — the number of reserved hours.

4. Click the **Constraints** tab.

The formula will be negative if the number of guests is less than eight.
To avoid this, set 9 as a minimal number of guests.
Now the pricing component will be applied only if the number of guests is 9 or more.
Save it.

You will get the following configuration:

Let's check.
Choose 2 hours and 11 guests.

Formula: **100 * (11-8)*2** = $600.

Look at the example in action.

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