The listed ChatGPT Plus price is $20 per month, but the actual charge can vary...

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

The listed ChatGPT Plus price is $20 per month, but the actual charge can vary from about $13 to $27 depending on where you subscribe. This happens because taxes like VAT or GST and extra fees added by app stores affect the final cost