"A typist uses a paper 30 cm by 15 cm. He leaves a margin of 2.5 cm at the top and bottom
Channel: Doubtnut
Date: 2020-04-05

"A typist
 uses a paper 30 cm by 15 cm. He leaves a margin of 2.5 cm at the top and
 bottom and 1.25 cm on either side. What percentage of paper area is
 approximately available for typing?
(a)
 60% (b) 65% (c) 70% (d) 80%"