Calculate the NPV at 12% and the IRR for the following projects. Find IRRs to the nearest

Question:

Calculate the NPV at 12% and the IRR for the following projects. Find IRRs to the nearest whole percent.
a. An initial outflow of $5,000 followed by three inflows of $2,000.
b. An initial outflow of $5,000 followed by inflows of $1,000, $2,000, and $3,000.
c. An initial outflow of $5,000 followed by inflows of $3,000, $2,000, and $1,000.
d. Notice that in parts (a), (b), and (c), a total of $6,000 is received over three years. Compare the NPVs and IRRs to see the impact of shifting $1,000 between years.