Answer: Hi!
They initially had 200 white hats, which is the 100%, and they sold 120 of them.
The percentage sold is the number of hats sold divided by the initial amount of hats, multiplied by 100%
(120/200)*100% = 0.6*100% = 60%
they sold 60% of the white hats.
For the black hats the sold 120 out of 300, using the same reasoning as before, the percentage of black hats sold is:
(120/300)*100% = 0.4*100% = 40%
They sold 40% of the black hats, and as we know 40% < 60%
they sold a greater percentage of the white hats.