Karla's candle factory is considering three different manufacturing options. Option A uses hand labor with fixed costs of $$15,000$ and variable costs of $$2\mathrm{.}25/$candle$.$ Option B uses a combination of hand and automation with fixed costs of $$20,000$ and variable costs of $$1\mathrm{.}55/$candle$.$ Option C is highly automated with fixed costs of $$25,000$ and variable costs of $$1\mathrm{.}10/$candle$.$

Based on comparing all three options, answer the following $($Cross$-$Over Analysis$)$

a$.$ If demand for Karla's candles is $8,500,$ which option should she pick?

$[$ Select $]$

$,$ and what is the cost?

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b$.$ If demand for Karla's candles is $12,000,$ which option should she pick?

$[$ Select $]$

$,$ and what is the cost?

$[$ Select $]$