7.5 because to answer this you would have to divide. First turn both into fractions. So then it would be 4.5/100 ÷ 0.6/100. then you would have to flip 0.6/100 to multiply the two fractions. so then it would be 4.5/100 × 100/0.6. this will give you 450/60. then you divide 450 by 60
