Find the grade-point average. Assume $A=4, B=3, C=2, D=1$, and $F=0$.
$\vdots$
\begin{tabular}{|c|c}
Units & Grade \\
\hline 3 & A \\
5 & B \\
3 & C
\end{tabular}

The grade-point average is $\square$.
(Type an integer or a decimal. Round to two decimal places as needed.)

Step 1 ：Define the grade points for A, B, C as 4, 3, 2 respectively.

Step 2 ：Define the units for the respective grades as 3, 5, 3.

Step 3 ：Calculate the total grade points earned by multiplying the grade points with their respective units and summing them up. This gives \(3 \times 4 + 5 \times 3 + 3 \times 2 = 12 + 15 + 6 = 33\).

Step 4 ：Calculate the total units attempted by summing up all the units. This gives \(3 + 5 + 3 = 11\).

Step 5 ：Calculate the Grade Point Average (GPA) by dividing the total grade points earned by the total units attempted. This gives \(33 / 11 = 3.0\).

Step 6 ：Final Answer: The grade-point average is \(\boxed{3.0}\).