Since a 16-ounce bottle of orange juice contains 200 milligrams of vitamin C, we can find the amount of vitamin C in 4 ounces by using a proportion:
16 ounces 200 milligrams
4 ounces x milligrams
Solving for x, we have:
x = 50 milligrams
So, Yosef drank 50 milligrams of vitamin C.
To find the percent of the daily recommended amount of vitamin C this represents, we can use another proportion:
80 milligrams 100%
50 milligrams x%
Solving for x, we have:
x = (50/80) * 100 ≈ 62.5%
Therefore, Yosef drank orange juice containing 62.5% of the daily recommended amount of vitamin C.