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Find elastic demand when price and quantity demand changed

When the price of Kellogg's Corn Flakes goes up from $1.89 to $2.05 as well as quantity demanded changes from 250 to 210, in that case the demand for Kellogg's Corn Flakes: (w) unitary elastic. (x) relatively inelastic. (y) relatively elastic. (z) perfectly elastic.

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