5.4 The Payback Rule TOGGEATOLOG Exercise5-9 DaTang company has a coal mine, and the price of coal will continue to rise. So, the financial manager is considering mining now or after six years. No matter when mining the initial investment is both $90 million, suppose the discounted rate is 10%, here are the cash flows for two mutually exclusive choices. Dollar values in million Initial Earning, Earning Earning, Earning. Earnings mining -$90 $82 $82 $82 $82 $92 $90 $115 $115 $115 $115 Please calculate the NPV Toda , and decide which one is a $125 better option? Years of Investment 6