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Price elasticity of demand over price range

When the price Pixie’s Restaurant charges for its well-known cheesy fried grits rises from $2 to $4 and quantity demanded falls from 750 to 500 servings weekly, the price elasticity of demand over such price range is approximately: (w) 5/3. (x) 3/5. (y) 8/9. (z) 125.

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