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Coconut oil is to be produced from dry copra in two stages. First, through expellers to squeeze out part of the coconut oil and then through a counter current multi- stage solvent extraction process. After expelling, the dry copra cake contains 25% residual oil. In the solvent extraction operation, 95% of the residual oil in the expeller cake is extracted as a solution containing 50% by weight oil. After the extraction process, the wt of insoluble cake was found to be 50kg. If solvent containing 1% oil is used and one kg of solution with every 2 kg of insoluble cake is removed with underflow. How many stages are required? If 1kg of solvent with every 2 kg of insoluble cake is removed with the underflow, how many stages are required?