3/8.This gives us
37.5% = 37.5 x 1/100 = 37.5/1 x 1/100 = 37.5/100
where 37.5 was rewritten as 37.5/1 and the two fractions were
multiplied together by simply multiplying their numerators and
denominators.
Now we need to multiply the numerator and denominator of the fraction by 10 to get rid of the decimal :
37.5/100 = 37.5/100 x 10/10 = 375/1000.
In order to find the simplest form of the fraction 375/1000 we cancel
out the greatest common divisor of 375 and 1000, which is 125 :
375/1000 = 3/8.
So the final answer is
37.5% = 3/8.