ChatGPT Plus is listed at $20, but the actual price you pay varies between $13...

https://tiny-wiki.win/index.php/ChatGPT_Plus_Price_in_Japan:_How_Much_is_%C2%A53,000_in_Dollars%3F

ChatGPT Plus is listed at $20, but the actual price you pay varies between $13 and $27 depending on where you subscribe. This happens because of taxes like VAT or GST, and extra fees from app stores like Apple or Google