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Let me clarify with some pictures for you. Please create a form which has dropdown field, then select it by clicking.
Then, follow instructions which is given in below picture
So you can see properties of dropdown listing,
As you can see there is a relation between options and calculation values,
Nothing -> 0
Option 1 -> 10.00
Option 2 -> 20.00
Option 3 -> 30.00
Option 4 -> 40.00
I hope this would be helpful for you.
If you have any questions please feel free to ask.
Yeah that's it! Thank you!!