A rectangular field adjacent to a river is to be enclosed. Fencing along the river costs $5 per meter, and the fencing for the other sides costs $3 per meter. The area of the field is to be 1200 square meters. Find the dimensions of the field that is the least expensive to enclose. 30m by 40m 10m by 120m O c. c. 3m by 400m O d. 20m by 60m a. O b.

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