Answer:
Amount of sale contributed by dinner was $100,000
Step-by-step explanation:
If total sales were $200,000 and breakfast sales were $20,000 and lunch sales were 40% of totales sales ($200,000 x 0,4=$80,000) that woud be:
$200,000 total sales
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$20,000 breakfast
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$80,000 lunch
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$100,000 dinner