"A field is in the form of a circle. A fence  is to be erected around the field. The cost of fencing
Channel: Doubtnut
Date: 2019-12-29

"A field is in the form of a circle. A fence
 is to be erected around the field. The cost of fencing would be Rs. 2640 at
 the rate of Rs. 12 per metre. Then, the field is to be thoroughly ploughed at
 the cost of Re. `0. 50\\ p e r\\ m^2`
. What is the amount required to plough the
 field? `[T a k e\\ \\ pi=22//7]`
."