Andrew calculates that 40 % 40% of 50 % 50% of x x is equal to 20 % 20% of 30 % 30% of y y, where x ≠ 0 x≠0. Which of the following is true?

a) y = 2x/3

b) y = 4x/3

c) y = 2x

d) y = 8x/3

e) y = 10x/3