Presuming the question is "How many points did he miss", you would find the solution by multiplying the amount of possible points by the test score as a fraction. 96% is the fraction [tex]\frac{96}{100}[/tex]. Therefore, you get the equation [tex]75*\frac{96}{100}[/tex]. This is equal to 72, so he missed 3 points, or 75-72 points.
He missed 3 points.