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प्रश्न
The cost of harvesting a square field at ₹ 900 per hectare is ₹ 8100. Find the cost of putting a fence around it at ₹ 18 per meter.
उत्तर
As, the rate of the harvesting=₹900 perhectare
And, the cost of harvesting= `Rs 8100`
So, the area of the square field=`8100/900=9` hectare
⇒ the area= 90000`m^2`
⇒ `"(side)"^2=90000 `
⇒`" side"= sqrt9000`
So, side =300m
Now, perimeter of the field =`4xx "side"`
=`4xx300`
= `1200 m`
Since, the rate of putting the fence=₹18 per m
So, the cost of putting the fence = `1200xx18= Rs 21600`
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