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

https://www.slideserve.com/aaron_ward92/why-does-chatgpt-plus-cost-more-on-android-than-on-the-web

ChatGPT Plus is listed at $20, but the actual cost you pay can range from about $13 to $27. This variation comes from factors like VAT or GST taxes and extra fees charged by app stores such as Apple’s or Google’s