To determine this, we need to set up proportions. x/100 = 75/500. A quick way to find x, the percentage we're looking for, is to cross multiply our fractions. 100 x 75 and 500 with x. 75 x100 = 7500, and 500 times x is 500x. 7500=500x Divide by 500 on each side. 15 = x Your answer is C.)15%. I hope this helps!