Please explain why the answer become thatespecially C and D

Which of the following statements is true for a project with a $20,000 initial cost, cash inflows of $6,667 per year for 6 years, and a discount rate of 15% ? A) Its payback period is 3 years. B) Its NPV is $2,094. C) Its IRR is 17.85%. D) Its profitability index is 0.104 . 2. Answer: A Explanation: Payback =$20,000/$6,667=3 years NPV=$20,000+$6,667[(1/0.15)1/0.15(1.15)6]=$5,231PI=$5,231/$20,000=0.262IRR=24.3%