The advertised ChatGPT Plus price is $20, but the actual cost often varies...

https://dibz.me/blog/is-there-a-chatgpt-plus-free-trial-i-can-click-to-start-1223

The advertised ChatGPT Plus price is $20, but the actual cost often varies between $13 and $27. This happens because of added fees like VAT or GST and extra charges from app stores