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Installing a solar panel system on your roof comes with a total upfront cost of $20,000. If the solar panels reduce your utility bill by $2,700 per year, what is the Payback Period of installing the solar panel system? Round to one decimal place. Type your response You are interested in buying a vending machine for $4,000 and placing it at a friend's business. If the present value of all future expected cash inflows (net of costs) from this vending machine is $4,500, what is the net present value of this purchase to you? Positive $500 Negative $500 $4,500 Not enough information to