the cost of cultivating a square field at the rate rs..., Area, General Mathematics

Question:The cost of cultivating a square field at the rate of Rs. 135 per hectare is Rs. 1215. The cost of putting a fence around it at the rate of 75 paise per metre would be :

A `Rs. 360` 
B `Rs. 810` 
C `Rs. 900` 
D `Rs. 1800`

/98

+ AnswerC

+ ExplanationArea `= (total cost)/Rate`

      `= (1215/135) hectares`

   `= (9 xx 10000) sq.m,`

:. Side of the square` = sqrt(90000) = 300 m.`

perimeter of the field` = (300 xx 4) m.`

                        `= 1200 m.`

cost of fencing` = Rs. (1200 xx 3/4)`

                    `= Rs. 900`

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