Suppose you have two types of fruits: berries and grapes. You find that 9 ounces of berry juice can be extracted from 3 portions of berries, and 10 ounces of grape juice can be extracted from 5 bunches of grapes. You make a fruit blend by mixing the juice from an equal number of berry portions and grape bunches. What percentage of this blend is berry juice?
30
40
50
60
70
