Question

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 metre. 

Answer 1

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`