Upgrade from gold to platinum

Hello gold account owners, or developers or I don't know who.

I wondered what the price of the upgrade from a gold account to a platinum one was. 40$ or 20$ ? (or a price between those two)?

Thank you in advance if you can answer my question. (Observe that I very foolishly thank those who know but won't answer.)

$20, if you're a gold account owner. This adds up to the $20 you paid before and makes it $40 in total.

Thank you