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Ramort Company reports the following for its single product. Ramort produced and sold $21,400$ units this year.

$\backslash$table$[[$Direct materials,$$17$ per unit$],[$Direct labor,$$19$ per unit$],[$Variable overhead,$$10$ per unit$],[$Fixed overhead,$$42,800$ per year$],[$Variable selling and administrative expenses,$$3$ per unit$],[$Fixed selling and administrative expenses,$$66,600$ per year$],[$Sales price,$$81$ per unit$]]$

Ramort doubles its production from $21,400$ to $42,800$ units while sales remain at the current $21,400$ unit level.

$($a$)$ Compute contribution margin when production is $42,800$ units under variable costing.

$($b$)$ What is the change in contribution margin by increasing production from $21,400$ units to $42,800$ units under variable costing?

Compute contribution margin when production is $42,800$ units under variable costing.

$\backslash$table$[[$RAMORT COMPANY,$],[$Contribution Margin $($Variable Costing$),,],[,,],[$Variable expenses,,$],[,,],[,,],[$Contribution margin,,$]]$

What is the change in contribution margin by increasing production from $21,400$ units to $42,800$ units under variable costing?

There is

in contribution margin.