I converted it to the btc(0.00003444btc) to usd at time which was $2.1 and seeing that it's considerable, I advice him to just use it.
If these are just two different examples, and in any case he will need to make a translation from many input transactions, then it does not matter separately or together, he will still have to pay this commission. If he will pay it separately, it will not be less than a sum of all transactions feeses.