Adding Damage to all weapons

I want to make it so that the damage would be the players strength x (0.1 x the item there holdings default damage) + the default damage of the item there holding

This is what I have and it should just constantly set the attribute of the player to that equation but for some reason it isn't working and the end values aren't right. Can someone help pleasehttps://imgur.com/a/NKeMqW1