ChatGPT Plus is listed at $20 a month, but the actual price you pay can vary...

https://www.mediafire.com/file/yjut74llakej1hf/pdf-37467-61545.pdf/file

ChatGPT Plus is listed at $20 a month, but the actual price you pay can vary from about $13 to $27. This difference comes from added taxes like VAT or GST and extra fees from app stores like Apple or Google