A typist uses a paper 30 cm by 15 cm. He leaves a margin of 2.5 cm at the top as well as at the bottom and 1.25 cm on either side. What percentage of paper area is approximately available for typing?

A. 65 %
B. 70 %
C. 80 %
D. 60%

Explanation:

Total Area of the Paper = (30 × 15) Sq.cm = 450 Sq.cm

Area Used = [(30-5)×(15-2.5) ]Sq.cm

= (25 × 12.5) Sq.cm = (25 x 25/2) Sq.cm = 625/2 cm2

Percentage are Used by = (625/2× 1/450×100) %

= 69.4 % = 70 % nearly

Correct Answer: 70 % ✔

Last Updated: February 07, 2020