How much are the taxes on app subscription in App Store in state of Florida?

Must have something to do with your location. Here's the main info you're looking for:

Sales Tax

Each sale, admission, storage, or rental in Florida is taxable, unless the transaction is exempt. Sales tax is added to the price of taxable goods or services and collected from the purchaser at the time of sale.

Florida's general state sales tax rate is 6% with the following exceptions:

• Retail sales of new mobile homes - 3%
• Amusement machine receipts - 4%
• Rental, lease, or license of commercial real property - 4.5%
• Electricity - 6.95%

Try this one. Same site, less complicated link directly to the sales tax rate page.

https://floridarevenue.com/taxes/taxesfees/Pages/sales_tax.aspx

Why don't you go to Florida's department of revenue site and look it up yourself?

https://floridarevenue.com/taxes/taxesfees/Pages/sales_tax.aspx#:~:text=Florida%27s%20general%20state%20sales%20tax,of%20commercial%20real%20property%20%2D%204.5%25

I suggest you research this yourself. You can do it very quickly using a web search engine. The tax may also depend upon in which city and county you are making your purchase.