38 4/7 = 270/7
% (percent) means per hundred (1/100)
so, (270/7)% is same thing as 270/700 or 27/70.
Answer: 270/100 or 27/70
        
             
        
        
        
Answer:
360 grams of cereal
Step-by-step explanation:
First you have to do 540 times 8 to find out how many grams of cereal he ate over the eight weeks. 
Then you have to divide the answer by 12 to get 360 grams of cereal. 
I hope this helped ;)