book Maths Puzzle Numerical Ability

On a trip Jennifer noticed that her car averaged 21 mi/gal of gas except for the days she used the air conditioning, and then it averaged only 17 mi/gal. If she used 91 gal of gas

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When the Intitail amount under compound interest is 102.5. And the initial amount under simple interest is 100. Both for a period of two years then what is the principal amount ? If the equationof a line isy=1/3x+2then
a.Give an exampleof an equation of another parallel to this one.
b. Give an example of a line perpendicular to this one.