The quantity demanded each week (in units of a hundred) of the Mikado digital camera is related to the unit price p (in dollars) by the demand equation x=√400−5p(0≤p≤80). (a) Is the demand elastic or inelastic when p = 30? What about when p = 60?; (b) When is the demand unitary?;(c) If the unit price is lowered slightly from $60, will the revenue increase or decrease? (d) If the unit price is increased slightly from $30, will the revenue increase or decrease?