the length and breadth of a rectangular plot are in the ratio of 7 : 4 if the area of the plot is 16128 m square find the cost of fencing the plot at the rate of rupees 4.5 per metre
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7a ×4a=28a^2=16128.a^2= 16128/28=576,a=24,perimeter=(7a+4a)×2=22a=528,528×4. 5=₹2376
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