Table here shows a straight-line demand curve that confronts a toy company. (a) In column 3, compute the coefficient for the price elasticity of demand at each price using the midpoints formula and in column 4, calculate total revenue. (b) Describe the character of elasticity in column 5, across the prices based on the total revenue test and the elasticity coefficient. (c) Does a straight-line demand curve have constant elasticity? Explain. (d) What price should the seller charge