Need your assistance on the following question:
The price of an orange and an apple is in the ratio of 4 : 5.
Mike has a sum of money to either buy 11 oranges with a change of 80 cents or 8 apples with a change of 1 dollar.
(i) Find the price of an apple.
(ii) Hence, calculate the change if $20 is spent on 8 oranges and 6 apples.