A sheet of rectangular paper measures 12 cm by 20 cm. At the edge of the paper, a margin exactly 1-cm wide is painted all the way around. What percentage of the area of the original rectangle remains unpainted?
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The 1cm around margin will be the length minus 2 and the breadth also minus 2
Original area is 12*20=240
Unpainted area is 10*18=180
Percentage area is 180/240*100=75%
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