(a) [2 points] Using the data, plot the consumer demand curve and the marginal revenue curve for Tiendatek. At what price point would revenue from Tiendatek sales be maximized? (b) [4 points] Given the cost of Tiendatek hardware, what price should David set for Tiendatek and how what quantity of Tiendatek sales should be targeted? Please provide supporting evidence for your recommendation and use the concepts of marginal revenue and marginal cost in explaining the rationale for why you chose this price and sales target. Cipherlab comes to David with a second purchase option. If he orders 900 tablet-reader combinations, Cipherlab will charge him $90000 (i.e., $100 per combo). David knows he would dispose of any excess inventories at the end of the year by selling to a local wholesaler, rather than hold inventory, and has a quote from one wholesaler for $70 per table-reader combo