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Determine demand when equilibrium prices given

Car prices and sales such that the costs per mile of auto passenger travel, and whole passenger miles driven have all rose from the 1940 year, demonstrating that: (w) auto travel is an inferior good. (x) the demand for auto travel is positively sloped. (y) the law of demand doesn’t apply to transportation. (z) the demand for auto travel has grown.

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

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