A teacher decided to put up a new blackboard in her classroom.The length and breath of the board are l cm and b cm. respectively (i)she decided to frame the board using a thick ribbon.If she needs 25cm more ribbon than the perimeter of the blackboard express the total ribbon length needed in terms of l and b (ii)what will be expenditure for making 50 such boards ,if the carpenter charge rs per board?
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refer from you text book
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refund from the given number of the
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