Asheet of 8.5 inch by 11inch paper has a mass of 4.50 grams one square centimeter , 1cm2 of that sheet of paper will have a mass closets to (hint use 1inch = 2.54 centimeters and area = length times
a) 7.3
b)0.73
c) 0.073
d) 0.0073

The answer is option D.

Area of sheet, A1  = length × breadth
                       =  (8.5 inch * 2.54 cm) ×11 inch * 2.54 cm) 
                       = 603.22

Now, Mass of sheet, M1 = 4.50 gms

Thus, Area of sheet A2, = 1
And, Mass of sheet, M2 = ?

Thus,  Mass of M2 = 
                                = 0.0073