Calculate the weighted average cost of capital. Calculate the weighted average cost of capital using book value weights and market value weights assuming a 35 percent marginal tax rate. Which cost of capital number is more relevant?

7/17/2020
stock price		$ 1,500.64
market cap		$ 278,368,000,000
beta		1.2
shares of stock outstanding		185,480,000
3 month treasury rate		0.11%
Market risk premium		7%
Tax Rate		35%
CAPM (Cost of Equity)		8.510%

Assets
Current assets
Cash and cash equivalents	$ 8,080,000,000
Accounts receivable, net	$ 1,274,000,000
Inventory	$ 4,494,000,000
Prepaid expenses and other current assets	$ 1,045,000,000
Total current assets	$ 14,893,000,000
Operating lease vehicles, net	$ 2,527,000,000
Solar energy systems, net	$ 6,106,000,000
Property, plant and equipment, net	$ 10,638,000,000
Operating lease right-of-use assets	$ 1,197,000,000
Intangible assets, net	$ 323,000,000
Goodwill	$ 193,000,000
Other non-current assets	$ 1,373,000,000
Total assets	$ 37,250,000,000
Liabilities	$ -
Current liabilities	$ -
Accounts payable	$ 3,970,000,000
Accrued liabilities and other	$ 2,825,000,000
Deferred revenue	$ 1,186,000,000
Customer deposits	$ 788,000,000
Current portion of debt and finance leases	$ 3,217,000,000
Total current liabilities	$ 11,986,000,000
Debt and finance leases, net of current portion	$ 10,666,000,000
Deferred revenue, net of current portion	$ 1,199,000,000
Other long-term liabilities	$ 2,667,000,000
Total liabilities	$ 26,518,000,000
Commitments and contingencies (Note 12)	$ -
Redeemable noncontrolling interests in subsidiaries	$ 632,000,000
Convertible senior notes (Note 10)	$ 60,000,000
Equity	$ -
Stockholders' equity	$ -
Preferred stock; $0.001 par value; 100 shares authorized; no shares issued and outstanding
Common stock; $0.001 par value; 2,000 shares authorized; 185 and 181 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	$ -
Additional paid-in capital	$ 15,390,000,000
Accumulated other comprehensive loss	$ (113,000,000)
Accumulated deficit	$ (6,104,000,000)
Total stockholders' equity	$ 9,173,000,000
Noncontrolling interests in subsidiaries	$ 867,000,000
Total liabilities and equity	$ 37,250,000,000