Binance Fees Calculation

Can anyone help me how does Binance calculate Maker/Taker Fees?

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According to Binance for example one is buying 10 ETH then Trading fee = 10 ETH * 0.1% = 0.01 ETH

Source: Binance Website

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But in few blogs I read

Suppose you have 250 USDT in your crypto wallet, which you intend to buy crypto. So what will be the trading fee that you’ll be charged?

Here’s a simple formula: (USDT amount that you’ll use / 100) * fees rate

Now, we have, (250/100)*0.10, which gives 0.25 USDT. Thus, you’ll be charged 0.25 USDT for using 250 USDT to buy Binance Coins (BNB). Simply put, by buying BNB with 250 USDT, you will get $249.75 worth of BNB.

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Pleaseif anyone can guide me the actual way Binance calculate fees