ChatGPT Plus is listed at $20, but the actual price you pay can range from $13...

https://www.click-bookmark.win/chatgpt-plus-has-a-list-price-of-20-per-month-but-the-actual-cost-can-vary

ChatGPT Plus is listed at $20, but the actual price you pay can range from $13 to $27. This difference is mainly due to taxes like VAT or GST and fees added by app stores, especially on iOS and Android