The question can be written as:
x/100 * 50 = 38
multiplying
50x/100 = 38
cross multiplying
50x=38(100)
multiplying
50x=3800
dividing
x=3800/50
So
x=76
So 38/50 is 76%
x/100 * 50 = 38
multiplying
50x/100 = 38
cross multiplying
50x=38(100)
multiplying
50x=3800
dividing
x=3800/50
So
x=76
So 38/50 is 76%