Consider the following project A; assume the discount rate is $8\%$ with the cash flows shown below.

Year Cash Flow $($A$)$

$0-$$$1,500,000$

$1400,000$

$2400,000$

$3400,000$

$4400,000$

$5400,000$

Calculate the following for Project A:

a$)$ Payback

b$)$ Discounted payback

c$)$ IRR

d$)$ NPV