F, is the answer. I put it on my packet.
Your answer should be:
(10-6)x(2+8)=40
A quadrilateral has 4 sides and 4 angle.
The sum of the 4 angles need to equal 360 degrees.
4th angle = 360 - 25-40-90
4th angle = 205 degrees.
So first we need to find the total number of boxes that the cookies could fit in:

Now we know that 47 boxes were made from this amount of cookies.
If Mr. Riley sells each box for 8, then we need to multiply the number of boxes by 8:

So Mr. Riley will collect a total of 376 from selling all of his cookies.