Solve the Problem A) $[ 50.55 ]$ ; the Value $50.55$ Is the Student's Overall Course Grade

Solve the problem.
-A math course has 4 exams weighted 15%, 10%, 20%, and 55%, respectively, toward the final grade. Suppose that a student earns grades of 75, 84, 92, and 86, respectively, on the four exams.
The weights are given in matrix W and the test grades are given in matrix G. Compute WG and Interpret the result.
$W=\left[\begin{array}{cccc}0.15 & 0.10 & 0.20 & 0.55\end{array}\right], \quad G=\left[\begin{array}{c}75 \\84 \\92 \\86\end{array}\right] \begin{array}{c}\text { Test 1 } \\\text { Test 2 } \\\text { Test 3 } \\\text { Test 4 }\end{array}$

A) $[ 50.55 ]$ ; The value $50.55$ is the student's overall course grade.
B) $[ 85.35 ]$ ; The value $85.35$ is the student's overall course grade.
C) $[ 80.15 ]$ ; The value $80.15$ is the student's overall course grade.
D) $[ 84.25 ]$ ; The value $84.25$ is the student's overall course grade.