the table and graph below show the weekly demand for machine screws at the local hardware store. demand for machine screws price (dollars per pack) quantity (packs of 100 screws) $5.00 0 4.50 60 4.00 120 3.50 180 3.00 240 2.50 300 2.00 360 1.50 420 1.00 480 0.50 540 0.00 600 instructions: round your answers to two decimal places. if you are entering a negative number include a minus sign. a. using the midpoint method, what is the price elasticity of demand from a price of $5.00 to a price of $4.00 per pack of 100 screws? b. using the midpoint method, what is the price elasticity of demand from a price of $3.00 to a price of $2.00 per pack of 100 screws? c. using the midpoint method, what is the price elasticity of demand from a price of $1.50 to a price of $0.50 per pack of 100 screws? d. at which price is demand the most elastic? (click to select)