I have the same problem with the last time. A have an update 10.1 Beta.
The first problem has i put in a 20% options and i show fix price (3€) on a product page. I would like to see this 20% Extra Fee.
So if i choose the second variant different price. I show same fix prices(3€) not change is a +20% (26€ +20%)=(5.20€), not 3€
Any idea how can I fix?