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

Year Cash Flow $($B$)$

$0-$$$2,000,000$

$1800,000$

$2600,000$

$3600,000$

$4600,000$

$50$

Calculate the following for project B:

a$)$ NPV

b$)$ IRR