One serving of granola provides 4% of the protein you need daily. You must get the remaining 48 grams of protein from other resources. How many grams of protein do you need daily?

If one serving of granola provides 4% of your daily protein, that means you need the another 96% of protein (which in this case is 48g)

x=48/0.96 (using x as daily protein)

x = 50

Therefore you need 50 grams of protein daily