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Sandhill Auto has $250$ auto$-$maintenance service outlets nationwide. It provides two main lines of service: oil changes and brake repair. Oil changes and related services represent $70\backslash \%$ of its sales and provide a contribution margin ratio of $20\backslash \%.$ Brake repair represents $\backslash (30\backslash \%\backslash )$ of its sales and provides a $\backslash (60\backslash \%\backslash )$ contribution margin ratio. The company's fixed costs are $\backslash (\backslash$$ $20,800,000\backslash )($that is$,\backslash (\backslash$$ $83,200\backslash )$ per service outlet$).$

$($a$)$

Calculate the dollar amount of each type of service that the company must provide in order to break even.

Oil changes

Brake repairs

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$($b$)$

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