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A typist uses a paper 30 cm by 15 cm....

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%

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