ChatGPT Plus lists for $20, but the actual price often ranges from $13 to $27....

https://research-wiki.win/index.php/ChatGPT_Plus_Deep_Research_Not_Working:_Did_I_Hit_the_10_Per_Month_Cap%3F

ChatGPT Plus lists for $20, but the actual price often ranges from $13 to $27. This difference comes from factors like taxes (VAT or GST) and fees added by app stores on iOS and Android