A typist uses a sheet measuring 20cm by 30cm lengthwise. If a margin of 2 cm is left on each side and a 3 cm margin on top and bottom, then percent of the page used for typing is  Select the correct option.
A) 40
B) 60
C) 64
D) 72
E) None
Solution   Area of the sheet	= (20 x 30 ) cm²   = 600 cm²   Area used for typing	= [(20 - 4) x (30 - 6)] cm²   = 384 cm²   Required percentage	= (384 / 600 x 100)%   =64%.   Answer 64
<result>C</result>
A typist uses a sheet measuring 20cm by 30cm lengthwise. If a margin of 2 cm is left on each side and a 3 cm margin on top and bottom, then percent of the page used for typing is