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Change in real income when price fall

I have a problem in economics on Change in real income when price fall. Please help me in the following question. When gas prices drop from $2.65 to $2.45, the biggest change in real income is realized by: (1) Harry Hustler who drives his 1995 Lincoln 200,000 miles/year selling electric tooth-picks. (2) Ernest Environmentalist who rode a mountain bike and does not own a car. (3) Freda Frugal who drives a Honda Civic 5,000 miles yearly. (4) Ichabod Impoverished who rode the bus.

Select the most appropriate option.

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