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. 80 %
B.  60%
C. 70 %
D.  65 %

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

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