Simple variable calculation

Hi everyone,
I’ve spent a long time now trying to get a basic calculation working, which multiplies two variables, however I keep getting ‘NaN’ displayed in my dynamic textbox instead of the answer.

I’ve attached my .fla to this message. Can anyone give me a hand with this its getting quite confusing? im completely open to different methods of achieving the same thing if they are easier or better i.e. numeric steppers etc.

Thanks for any help you can give me
Splash :red: