What will be the cost of gardening 1 meter boundary around a rectangular plot having perimeter of 340 meters at the rate of Rs. 10 per square meter ?
A. 3410
B. 3420
C. 3430
D. 3440
Correct Answer :
D. 3440
In this question, we are having perimeter. We know Perimeter = 2(l+b), right So, 2(l+b) = 340 As we have to make 1 meter boundary around this, so Area of boundary = ((l+2)+(b+2)-lb) = 2(l+b)+4 = 340+4 = 344 So required cost will be = 344 * 10 = 3440