Far calculations please just give formula to use.

7. You now have all the necessary information to calculate the weighted average cost of capital for TSLA. Calculate this using book value weights and market value weights, assuming TSLA has a 21 percent marginal tax rate. Which weight is more relevant, book value weight or market value weight, and why? (For cost of debt, simply use the book value weight to proxy the market value weight, because there are typically not too much differences for debts in terms of book value and market value.)