If 28% of a number is 75 less than 43% of the same number, then 30% of that number is:

30% of the number is 150.

28% of x is 75 less than 43% of x : 0.43x - 0.28x = 75.

So 0.15x = 75, giving x = 500.

Then 30% of 500 = 0.30 x 500.

This equals 150.