Simple math expressions

So I was looking into making a thing where when people select an number and then next to it their is a quantity so I want to do the (number * the quantity) + (number2 * quantity2) etc…

I couldn’t find it in the bubble and the numbers are going to be based off a database when they select an option it will populate with the numbers set for that option so it would need to be dynamic
Not sure how to make it please help…

I answered this question here, on your other post about the same topic.

I’m going to close this thread so the conversation on this topic stays in one place.