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5.4 The Payback Rule tiks CATETYCH RODNE A DIOKOST Exercise5-10 In order to improve the production efficiency. There are two mutually exclusive projects. The one is a semi- automation project A, which needs $160 million initial investment, and increases firm cash flow by $80 million for 3 years. The other one is a full automation project B, which needs $210 million initial investment, and increases firm cash flow by $64 million for 6 years. Suppose the opportunity cost of capital is 16%, which project should be invested