Net income = $50million; Debt = $1 billion; Interest = $150 million; 
Depreciation = $100 million; Capital expenditures = 200% of
depreciation; Cost of capital = 11%; Tax rate = 50%; Working capital
requirment = 0; Growth rate = 4% in perpetuity. Estimate the value of
firm showing labeled calculations.

From page 34 of the source, we obtain the following equations:

The Value of the Firm = Free Cash Flow to the Firm/(cost of capital -
expected growth rate in perpetuity)

The Free Cash Flow to the Firm = Earnings Before Interest and Taxes (1
- tax rate) (1 - Reinvestment Rate)

The Reinvestment Rate = (Capital Expenditures - Depreciation - change
in Working Capital)/[Earnings Before Interest and Taxes (1 - tax
rate)]

By definition, (Earnings Before Interest and Taxes - Interest) (1 -
tax rate) = Net Income

We know that interest expense is $150 million, the tax rate is 50%,
and the net income is $50 million.  Therefore, Earnings Before
Interest and Taxes are $250 million.

That makes the Reinvestment Rate = ($200 million - $100 million -
0)/[$250 million (0.5)] = 0.8.

In turn, the Free Cash Flow to the Firm = $250 million (0.5) (0.2) = $25 million.

Now we can calculate the Value of the Firm.  It is $25 million/(0.11 -
0.04) or $357.14 million.

Sincerely,

Wonko

Source: "Valuation: Principles and Practice"
http://pages.stern.nyu.edu/~adamodar/pdfiles/acf2E/Chap12.pdf

Wonko-ga provided exactly what I asked for. I hope he is available for
similar questions I anticpate coming in the near future.