Firstly we need to know the price of 1 mint chocolate, if four are equal to $2.00 then one is equal to:

That equation would allow us to know the price of a single mint chocolate being $ .05.
therefore you now know the price of one mint chocolate now to know how much you can get for five dollars you see how many times 0.5 can go in 5
Approximately 10 times
therefore we can get 10 mint chocolates from $5