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We consider two bio-economic ratio-dependent predator-prey models for prey harvesting,one without and the other with additional food supply to the predators.We analyze the stability of the equilibrium points and determine the maximum sustainable yield.We then study the problem from the perspective of control theory with the additional food supply as a part of the effort,in addition to the traditional approach of adding a harvesting term.It is shown that the inclusion of additional food into the effort could result in more profitable harvesting even after accounting for the cost of additional food supply.