A poster mesuring 20×80 cm is pasted on a sheet.of cardboard such that there is a margins of 3:5cm along each side of the poster .find the of cardboard used at the rate of 1.50 per sq cm
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area of rectangle =20×80=1600
sheet of cardboard of 3:5=3x+5x=8×
8×=1600÷8=200
cardboard used at rate of 1.50
200×1.50
=300
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