Donald Donuts is having a sale on donuts. For every 5 donuts that you buy, you get 1 free. If Mickey wants to have 200 donuts for a party, how many must he buy?
Details and assumptions
Note: If Micky buys 1000 donuts, he only gets 200 free donuts. He does not get another 40 free donuts because of the 200 free donuts.