Given the following information for a levered and unlevered firm, calculate the difference in the cash flow available to investors. Assume the corporate tax rate is $40$ percent.

$($Hint: Calculate the tax savings arising from the tax deductibility of interest payments$).$

Levered Unlevered

Revenue $ $250$ $ $250$

Operating cost $$$ $100$$ $100$

Interest expense $$$ $20$ $ $0$

Group of answer choices

$$8$

$$18$

$$78$

$$90$