character: Mr. Johnson
topic: Cost-Benefit Analysis of Solar Power
grade: 8
subject: Economics
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character: Mr. Johnson
topic: Renewable Energy Advantages
grade: 8
subject: Economics
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character: Mr. Johnson
topic: Impact of Solar Power on Economy
grade: 8
subject: Economics
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character: Mr. Johnson
topic: Evaluating Energy Sources
grade: 8
subject: Economics
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