Hi tutors, I don't quite know what is the meaning of "utilizing the maximum available margin of 10%". What is the difference between this and just "buy shares on the margin of 10%"?

d. An investor buys shares in a public company for $35.00 per share, utilizing the maximum available margin of 10%. Assuming the shares increase in value. this investors return on investment before interest and commission will be: (1 mark) The same as the return on investment earned by an investor who did not buy on margin Double the return on investment earned by an investor who did not buy on margin Cannot be determined 0 O V None of the above