The length of a rectangular wooden board is thrice its width. The width is of the board is 120 cm , find the cost of framing it at the rate of$5/20cm
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$ 240
length= 360cm
breadth=120 cm
perimeter=2(l+b)
=2(360+120)cm
=2(480)cm
=960cm
Cost of framing 960m @ $5/20cm= $240
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