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I believe the initial answer is B. The labor cost per day of hiring two workers is $150. I'm not sure about the last question.
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wait who is this by? I want to find it so I can help
The correct answer of the given question above would be the third option. What the main idea does not do is to show what a reader will learn, rather, it only shows what the story is about, summarizes the details and events, and illustrates an important idea. Hope this answers your question.
How was your summer? Mine went great, here are some things that I did in the summer.(briefly list