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If you want the size for a specific transaction, you could calculate it here: https://bitcoinops.org/en/tools/calc-size/
For a 1 to 1 taproot tx, it would be 111vBytes
Dollar amounts are for the average native segwit transaction of 140 vBytes (you can see explanation if you hover over it on desktop).
Also for my reference, how many VBytes would a simple transaction roughly be that spends an entire UTXO to another address with no change?