Answer:
11.7%
Explanation:
let´s first calculate the initial invested money, it envolves the margin account plus the shares bought:
[tex]Capital(t=o)=\frac{200*10}{0.7}[/tex]
Capital(t=0)=3,428
so it means in the margin account there are left 1,428. Now let´s calculate the amount of money a year later:
Capital(t=1)=200*12 + 1,428
Capital(t=1)=3,828
Finally we can now calculate the return after a year:
[tex]return=\frac{final value}{initial value}-1[/tex]
[tex]return=\frac{3,828}{3,428}-1[/tex]
return=11.7%