Sort of a blend of the P51 and the A1 Skyraider. Shows you that those designs were good ideas so long ago.
Seems like existing platforms could have been modified for a whole lot less.
The Super Tucano IS an existing design.
I have no idea what goes into that price per aircraft. Neither do you. Usually, the price reported is some sort of total program cost, divided by the number of aircraft produced. This tends to inflate the apparent cost of small production runs, and deflate the apparent cost of large production runs. Usually, Big Media will do anything it can to inflate the apparent cost of any military equipment purchase.