An open top rectangular tank with square bases is to have a volume of 10 cubic meters. The material for its bottom cost P150.00 per square meter, and that for the sides is P60.00 per square meter, and that for the sides is P 60.00 per square meter. The most economical height is: A 2 meters (B 2.5 meters 3 meters D) 3.5 meters

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