United Parcel Service Inc. was trading at $$97\mathrm{.}53$ on December $31,2018.$ Its dividend per share was $$3\mathrm{.}84,$ its market beta was estimated to be $1\mathrm{.}44,$ its average pretax borrowing rate was $2\mathrm{.}6\%,$ and its assumed statutory tax rate was $22\mathrm{.}4\%,$ consisting of the $21\%$ federal rate plus the $1\mathrm{.}4\%$ state and local rate, net of any federal benefits.

UPS$$s market value of equity $($market capitalization$)$ was $$83\mathrm{.}90$ billion, computed as $860\mathrm{.}2386$ million shares times its $$97\mathrm{.}53$ price, and its total market value $($enterprise value$)$ was $$107\mathrm{.}19$ billion, computed as $$83\mathrm{.}90$ billion in equity plus the fair value of long$-$term debt of $$23\mathrm{.}29$ billion $($disclosed in note $8$ of the financial statements$).$

Assume a risk$-$free rate of $2\mathrm{.}1\%$ and a market risk premium of $5\%$ to answer the following requirements. Estimate UPS$$s cost of debt capital, cost of equity capital, and weighted average cost of capital.