If x % of 80 = 20% of y, then x = ? and y = ?

A. x = 20, y = 20
B. x = 20, y = 40
C. x = 20, y = 80
D. Cannot be determined
Explanation:
x % of 80 = 20 % of y => x / 100 (80) = 20 / 100 (y)
=> 4x = y
i.e x / y = ¼