Heather's water heater needs repair. The plumber says it will cost $300 to fix the unit, which

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Heather's water heater needs repair. The plumber says it will cost $300 to fix the unit, which currently costs $75 per year to operate. Or Heather could buy a new energy-saving water heater for $500, including installation, and the new heater would save 60% on annual operating costs. How long would it take for the new unit to pay for itself?
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Discovering Advanced Algebra An Investigative Approach

ISBN: 978-1559539845

1st edition

Authors: Jerald Murdock, Ellen Kamischke, Eric Kamischke

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