Summit Builders has a market$$ debt$-$equity ratio of $0\mathrm{.}80,$ a corporate tax rate of $22\%,$ and pays $9\%$ interest on its debt. By what amount does the interest tax shield from its debt lower$$ Summit's WACC?

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Part $1$

WACC is lowered by

$$

enter your response here$\%.($Round to two decimal$$ places.$)$