Given the Opening Price of a British Stock Is $\le$ 50 a Share with a Spot Rate Of

Given the opening price of a British stock is $\le$ 50 a share with a spot rate of $\le$ 0.5/$, what will be the real return rate if the ending price becomes $\le$ 40 with an ending spot rate at $\le$ 0.4/$?

A) -36%
B) -20%
C) 80%
D) Zero
E) 64%