Let's compute bananas first. Apples 8%, Bananas 28% and Oranges 56%
Let's start with Bananas (only unknown parameter and one equation):
The equation will be (B is for bananas, O is for oranges and A is for apples. Total votes for these (92). Total votes 100.
Oranges are twice this amount:
Apples get 20 percent less than bananas
Total percentage (of these three) is 92.
Apples got 8%, Bananas got 28% and Oranges got 56% of the votes.