The demand function for a product is modeled by  p = 400 − 4x,   0 ≤ x ≤ 100,  where p is the price per unit (in dollars) and x is the number of units. (a) Determine when the demand is elastic and inelastic. (Enter your answer using interval notation. If an answer does not exist, enter DNE.) elastic demand       inelastic demand       Determine when the demand is of unit elasticity. (Enter your answers as a comma-separated list.) x =

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