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Effects when rental price and quantity demand raise

When the rental price of DVDs start from $2.50 to $.99 and the quantity demanded raises from 510 to 820 in that case the price elasticity of demand to rent DVDs is: (w) perfectly elastic. (x) perfectly inelastic. (y) relatively elastic. (z) relatively inelastic.

Please choose the right answer from above...I want your suggestion for the same.

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