8. Four mark example problems II

A farmer wants to fence his circular poultry farm with barbed wire whose radius is $420 \ m$. The cost of fencing is $₹12$ per metre. He has $₹30,000$ with him. How much more amount will be needed to fence his farm? (Here $\pi = \frac{22}{7}$)

 

Answer:

 

Length of the barbed wire $=$  $m$

 

Cost of fencing the poultry farm $= ₹$

 

Excess amount required $= ₹$