Question: how much juice from 1 kg orange?
Answer: In metric terms we will asume that 1 litre of orange juice weighs 1 kilogram. So from this "normal" orange, we can see that we can get 1 kg (1 litre) of orange juice from 1.76kg of whole oranges (8 x 220g). So our yield is 1.0/1.76 = 56.8%.