Cullumber Bucket Co$.,$ a manufacturer of rain barrels, had the following data for $2019.$

$\backslash$table$[[$Sales$,2,990,$units$],[$Sales price,$$40,$per unit$],[$Variable costs,$$20,$per unit$],[$Fixed costs,$$35,880,]]$

$($a$)$

What is the contribution margin ratio?

Contribution margin ratio

$\%$