The table below shows the weekly demand for machine screws at the local hardware store. Demand for Machine Screws Price (dollars per Quantity (packs of pack) 100 screws] _ m_ -E_ a. Using the starting point method, what is the price elasticity of demand from a price of $7.50 to a price of $7.00 per pack of 100 screws? b. Using the starting point method, what is the price elasticity of demand from a price 0f $5.50 to a price of $5.00 per pack 0f100 screws? c. Using the starting point method, what is the price elasticity of demand from a price of $4.00 to a price of $3.50 per pack of 100 screws