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Question
A rectangle display board have length as 10 m and breadth as 8 m. What is the length of the ribbon that will be added around the display board? If the cost of the ribbon is 10 dollars per metre then how much money does David needs to buy the ribbon?
A rectangle display board have length as 10 m and breadth as 8 m. What is the length of the ribbon that will be added around the display board? If the cost of the ribbon is 10 dollars per metre then how much money does David needs to buy the ribbon?
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Solution
The correct option is A 360 dollars
Length of the display board = 10 m
Breadth of the display board = 8 m
Perimeter of the display board :
=2×(Length + Breadth)
=2×(10+8) m
=2×18 m = 36 m
Therefore, total cost for 36 m long ribbon = 10×36=360 dollars.
Length of the display board = 10 m
Breadth of the display board = 8 m
Perimeter of the display board :
=2×(Length + Breadth)
=2×(10+8) m
=2×18 m = 36 m
Therefore, total cost for 36 m long ribbon = 10×36=360 dollars.
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of yellow ribbon, 
of red ribbon and 
of blue ribbon to decorate a mantap. If the cost of 1 metre of ribbon is Rs. 6/-, find the cost of ribbons bought by him.