Question

The cost of cultivating a square field at the rate of $Rs.360$ per hectare is $Rs.3240$. What is the cost of putting a fence around it at $75$ Rs. per metre?

• A. $Rs.360$
• B. $Rs.810$
• C. $Rs.900$
• D. $Rs.1800$

Answer 1

Answer: (C)

$Rs.900$

Let side of square field be $a$

Cost per hectare $=360$

Total cost $=3240$

$\Rightarrow$ Area of square field $=\frac{3240}{360}=9m^2$

Also, Area of field $=a^2=9$

$\therefore a=3m$

Perimeter of square $=4a=12m$

Cost of fencing per metre $=75$ paise

$\therefore$ Total cost of fencing $=75\times 12=900$ Rs.