Answer:
A
Explanation:
To find the fraction he has done so far, we need the total number and the amount he has done. The total number (150) goes on the bottom. The amount he has done so far (50) goes on the top. this shows he has done 50 pieces out of the entire 150 pieces. Now, all we do is simplify the fraction. 50/150 is the same as 1/3