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Hello there. I really need help solving this problem. I have no idea what I'm doing. The question reads:

 A two-day environmental clean up started at 9AM on the first day. The number of workers fluctuated as shown in the figure.

Suppose that the workers were paid 19 dollars per hour for work during the time period 9 am to 5 pm and were paid 28.5 dollars per hour for work during the rest of the day. What would the total personnel costs of the clean up have been under these conditions?

And the attached graph is here:

I would just count the squares under the curve but that would give me an estimate. And the problem doesn't give me a formula so that makes it more challenging.

 
 Jul 4, 2018

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