(24 - 20) x 5 = 200. 
When Koko and Koala does not sleep, he eats 50 grams of leaves per hour. Yesterday, he slept 20 hours. How many grams of leaves did he eat yesterday? 
(A) $$0$$ 
(B) $$50$$ 
(C) $$100$$ 
(D) $$200$$ 
(E) $$400$$ 