Energy and wealth

1. The problem statement, all variables and given/known data

See attachment

2. Relevant equations

See attachment

3. The attempt at a solution

Im not sure what they mean with ‘highest possible’ and how to use the increase of kWh/O,4$/year/person.
Can somebody help me?

Attached Images
File Type: jpg image.jpg (52.5 KB)

http://ift.tt/1lT5JnW

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