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Determine slope of demand for given price and elasticity

For edcah $.10 per gallon hike within gasoline prices, Ima Driver cuts her monthly consumption of gasoline with 5 gallons. There slope of her demand for gasoline: (w) 1/2 when the change in price is expressed within cents, and 500 when the change in price is expressed within dollars. (x) 2 when the change within price is expressed into cents and 0.02 when the change within price is expressed into dollars. (y) similar whether price changes are expressed within cents or dollars. (z) not possible to compute from the information specified.

Can anybody suggest me the proper explanation for given problem regarding Economics generally?

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