A Rectangular Field Having an Area of 2700 Square Meters

Multiple Choice

A rectangular field having an area of 2700 square meters is enclosed by a fence. An additional fence is to be used to divide the field down the middle. The cost of the fence down the middle is $12 per meter, and the fence along the sides costs $18 per meter. The dimensions of the field such that the cost of the fencing will be the least are
​

A) 40 m by 67.5 m
B) 45 m by 60 m
C) 30 m by 90 m
D) 54 m by 50 m
E) 27 m by 100 m