Martin brought 30 shares of microsoft at the close price of $24.53. In a few years, Martin sells all of his shares at $33.71. How much money did martin make?

Difference: 33.71 - 24.53 = 9.18

9.18*30 = 275.4

Of course, we can't take into account inflation, because nothing is said, I mean that the $24 a few years ago are not the same as today ...