the figure below represents the weekly demand for gps units. instructions: round your answers to two decimal places. if you are entering a negative number include a minus sign. a. using the starting point formula, what is the price elasticity of demand for going from a price of $160 per unit to a price of $140 per unit? b. using the starting point formula, what is the price elasticity of demand for going from a price of $140 per unit to a price of $160 per unit? c. using the midpoint formula, what is the midpoint price elasticity of demand for gps units between a price of $140 per unit and a price of $160 per unit? d. using the starting point formula, what is the price elasticity of demand for going from a price of $40 per unit to a price of $20 per unit? e. using the starting point formula, what is the price elasticity of demand for going from a price of $20 per unit to a price of $40 per unit? f. using the midpoint formula, what is the midpoint price elasticity of demand for gps units between a price of $20 per unit and a price of $40 per unit?