hello dear community members.
i'm a newby in RSForm,that's why i need help.
i'm trying to create currency converter. for this purpose i've placed 2 text box ( input and amount) , dropdown box (combobox) and button (for submission ) .
now, i don't know where to write down the action script )) and what to write down. for example i need something like this.
User enter input value ( let's say it's 0.8) ,amount (let's say 100) and choose from dropdown Care-Mare (for example) . in this case submit button must do following calculation

0.8*100=80

that's it ))
please,help me to find a way out of this situation.

Thank you everyone !