the typist uses a sheet measuring 20 centimetre by 30 centimetres length wise if a margin of 2 centimetres left on each side and a 3 centimetre margin on top and bottom find
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usable area=(20−2−2)(30−3−2)
=16×24
=384cm
area of sheet=20×30=600cm
% area used for typing= 600
384 ×100=64%
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