Google sheets , When Checkbox checked change currency

I can't figure out how to change the currency in my sheets when I press the Checkbox. Link to sheet

I want :

1. When pressed(checkbox on LINE : B10)
2. Collums : from: C10 to L10 changes to Eu(€)

I know that I can Format to any currency manualy, but I'm doing this for an old person, so I'm trying to make this as conveniant and easy as possible.