The cost of cultivating square field at the rate of rupees 360 per hectare is rupees 3240. What is the cost of putting a fence around it at 75 paise/ metre.
(a)360
(b)810
(c)900
(d)1800
3240 rupees total
360 rupees per hectare
$\displaystyle \frac{3240}{360}= 9$ hectares.
9 hectares = 9(10000 metres)= 90,000 square metres
Since the field is square, each side of the field is $\displaystyle \sqrt{90000}=300$ metres.
Fencing to enclose 4 sides of 300 metres would require 1200 metres of fencing.
At 75 paise per meter, that would be 75(1200)= 90,000 paise or 900 rupees.
100 paise = 1 rupee
90,000 paise = 900 rupees