I need some help.

In a form I have made a Lookup. This Lookup refers to a VAT dropdown menu. I can choose different VAT rates (6.0, 8.0, 10.0 etc.).

Now I want to multiply the chosen VAT rate with a Value field. I do this with the Formula button.

The outcome however is a very long number -> 358930000000120350.00

What am I doing wrong?

Kind regards,

Arthur