The diagram shows a circle graph which shows the amount of homework done each day by Mr. Auckland's Grade 9 class. Based on the circle graph, what percentage of students do at least one hour of homework per day?
(A) $25 \%$
(B) $33 \%$
(C) $50 \%$
(D) $67 \%$
(E) $75 \%$

Hours of homework per day

![](https://cdn.mathpix.com/cropped/2024_04_20_6ed09463f225f8ba1f07g-081.jpg?height=337&width=352&top_left_y=257&top_left_x=1342)

Part B: Each correct answer is worth 6.
Because the central angle for the interior sector "Less than 1 hour" is $90^{\circ}$, then the fraction of the students who do less than 1 hour of homework per day is $\frac{90^{\circ}}{360^{\circ}}=\frac{1}{4}$.

In other words, $25 \%$ of the students do less than 1 hour of homework per day. Therefore, $100 \%-25 \%=75 \%$ of the students do at least 1 hour of homework per day.