Explain the substantive differences between an elastic function, a unit elastic function and an inelastic function in a linear supply function?

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When the price of an item was raised from $12 to $18, the quantity supplied increased from 800 to 1,200 per month. The price elasticity of supply is (Round to two decimal places and use the midpoint formula.) Supply is

Suppose that when the price of laundry detergent decreases from $4.10 to $3.50, quantity supplied decreases from 260 to 180. Using the mid-point elasticity approach, calculate price elasticity of supply