How to calculate a sum from an input and radio buttons?

[dev15]

Hello everyone, I’m new to bubble and struggeling with a simple calculation. Maybe you can help me?

Let’s assume a service costs $1 per minute if option A is selected and if option B is selected, then the service costs $5 per minute. Now I would like to calculate the price depending on the input and the selected option in real time. What would be the best way to achieve this?

[SerPounce]

Your text element for Price will have as its Appearance: Input minutes * 1.
Then add a condition When radio button option = B, text Price’s Appearance: Input minutes * 5.

[dev15]

Thank you for your support.