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

https://milosinterestingcolumns.huicopper.com/why-does-google-play-add-cost-to-chatgpt-plus-if-google-takes-15

ChatGPT Plus is listed at $20 a month but the actual price you pay can vary. That’s because taxes like VAT or GST depend on your country. Buying through app stores can add extra fees on top. Also, there’s no free trial you can start with one click