Q$4$: A company has interest expenses totaling $=$$$722MM,$ for which they pay $7\frac{\%}{?}$ annum to their lender. Last year, the company paid $$827$ MM in tax, hased on earnings before taxes of $$4,135M$; what amount of additional taxes would the co$.$ pay if they were all equity$-$financed $($i$.$e$.,$ no debt$)$ and what is the PV of tax shield $($assume all metrics stay constant in perpetuity$)?$

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