In a bin at the Cayley Convenience Store, there are 200 candies. Of these candies, 90\% are black and the rest are gold. After Yehudi eats some of the black candies, 80\% of the remaining candies in the bin are black. How many black candies did Yehudi eat?
Answer Choices
A. 2
B. 20
C. 40
D. 100
E. 160