The length of a rectangular wooden board is thrice its width. If the width of the board is 120 cm, find the cost of framing it at the rate of Rs5 for 20 cm.
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width of the board = 120cm
length of the board = thrice its width
= 3×120cm
= 360cm
perimeter of the the rectangular board= 2×(length + breadth)
=2×(120+360)
= 960cm
cost of framing 20cm = Rs5
cost of framing 1 cm = Rs20/5
=Rs 4
cost of framing 960cm= Rs 4×960
=Rs 3840
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