Odk builder using calculate

Hello friends, i want to use calculate in ODK builder platform but it is not working out,
any one please demonstrate it for me. thnks

Hi @jsekibamu
Welcome to the ODK forum. We're glad you're here. When you get a chance, please introduce yourself on this forum thread. I'd also encourage you to add a picture as your avatar because it helps build community!

Could you please tell us more about your problem? What have you tried and what didn't work? This topic might help you a bit if you are new to calculations in ODK Build Performing calculations in ODK Build