Payback period,NPV,PI

Sir, I could not understand how to solve it. So i need help. Could you please give me some info about these questions? What steps and formulas Do i have to use?
 
"steps and formulas" Well, this is the nature of the assignment. If we tell you all of that, we have done your assignment for you. The final answer is of little consequence. Use Present Value formulas. Go!
 
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