People who selected blueberry = 40
People who selected grapes = 5
People who selected either/or of the above = 40 + 5 = 45
People who selected banana = 10
People who selected orange = 30
People who selected either/or of the above = 10 + 30 = 40
The ratio of the two numbers is 45:40 or 45/40 or 9/8 or the number you are looking for: 112.5%
