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Mathematics 20 Online
OpenStudy (anonymous):

The amount of a monthly electric bill (B, measured in $) depends on the amount of electricity used that month (E, measured in kWh). A typical public utility charges $0.12 per kWh for the first 300 kWh used, $0.17 per kWh for the next 600 kWh used, and $0.29 per kWh for any excess electricity used that month. How much would I have to pay if the amount of electricity used was 800?

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