Use the following information to answer questions 50-52
Marcia makes and sells handcrafted picture frames in 2 sizes: small and large. It takes her 2 hours to make a small frame and 3 hours to make a large frame. The shaded triangular region shown below is the graph of a system of inequalities representing weekly constraints Marcia has in making the frames. For making and selling s small frames and
large frames, Marcia makes a profit of 
dollars. Marcia sells all the frames she makes.
51. For every hour that Marcia spends making frames in the second week of December each year, she donates $3 from that week's profit to a local charity. This year, Marcia made 4 large frames and 2 small frames in that week. Which of the following is closest to the percent of that week's profit Marcia donated to the charity?
Your Answer is
Correct Answer is C
Explanation
The total hours of production is 4×3+2×2=12+4=16 hours. Then the donation amount is 3 x 16 = $48. The total profit is 30×2+70×4=60+280=$340. Then the proportion of donations is 48÷340≈14%. So choose C.