Pls me asap with 37 (show work + correct answer only) * lots of points!

B 
42 times 25.5=1071
771.1/1071= 0.72
(rounded)
not sure

First, we need to find the area of the wall.  We do this by multiplying the length times the width.  This is equal to 42*25.5=1070 square feet.  Now, we divide the cost by the area to find our answer.  This is equal to 

771.12/1070=$0.72 dollars per square foot, or answer B.