A Standard sheet of typewriter paper is 8 1/2 in. by 11 in.. Don types on a 7 in by 9 in. area of the paper. What is the area of the margins?
Area of paper = 8.5*11 = 93.5 in²
Area of text = 7*9 = 63 in²
Area of margin
=area of paper - area of text
= ?