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A rectangular field is to be enclosed on four sides with a fence. Fencing costs $8...

A rectangular field is to be enclosed on four sides with a fence. Fencing costs $8 per foot for two opposite sides, and $3 per foot for the other two sides. Find the dimensions of the field of area 870 ft2 that would be the cheapest to enclose.

A) 11.1 ft @ $8 by 78.7 ft @ $3

B) 18.1 ft @ $8 by 48.2 ft @ $3

C) 78.7 ft @ $8 by 11.1 ft @ $3

D) 48.2 ft @ $8 by 18.1 ft @ $3

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