Add 2 decimal numbers - Brazil notation

Hi everybody!

I’m a newcomer in Appgyver. I’ve been trying implement an app that need to sum prices but without success.
I’ve tried to build a small calculator just to add 2 numbers (brazillian currency). But no matter how try there is no way to get the right result.
By the way, in Brazil decimal notation are expressed by comma. (over thousand the separator is dot)
eg: 5,49 + 3,33 = 8,82
1.240,45 * 2 = 2.480,90

Thanks for any help!