Answer:
I believe that Sam would need 6 cups of vegetable oil.
Explanation:
Altogether in her 4 batches she would need 48 fl. oz. Since you put that 8 fl. oz. = 1 cup, we know that 1 cup of vegetable oil will be equivalent to 8 fl. oz of oil. Thus, we do 48÷8, which equals to 6.