Which of the following expressions can be used to calculate break$-$even sales revenue with the contribution margin ratio $($CMR$)?$

Which of the following expressions can be used to calculate break$-$even sales revenue with the contribution margin ratio $($CMR$)?$

$($Fixed costs $+$ variable costs$)$ x CMR

CMR $/$ fixed costs $(/$ means divided by$)$

CMR x fixed costs

Fixed costs $/$ CMR