4. Location Choice Consider four cities A, B, C and D located as follows: A D Suppose the residents of these cities consume widgets, with consumption in each city equaling 100 widgets. The firm that produces widgets must decide how to arrange its production. It could set up four factories, one in each city, with each factory producing 100 widgets. In this case the firm incurs no cost for shipping its output. Or the firm could locate its factory in the centrally located city (D). The single factory must then produce 400 widgets, 300 of which are shipped to cities A, B, and C. The shipping cost per widget is $2. A final assumption is that widget production exhibits economies of scale, with the cost per widget in a factory falling as output rises. a. Suppose the cost per widget varies with output as follows: cost is $4 if factory output is 100 widgets; cost is $1 if factory output is 400 widgets. In this situation, find the lowest cost arrangement of production for the firm. b. Repeat a. if the cost per widget varies with output as follows: cost is $4 if factory output is 100 widgets; cost is $3 if factory output is 400 widgets. c. Explain intuitively any difference in answers to a. and b. d. Suppose production costs are those given in a., and let shipping cost per widget be given by t. Although t=2 in a., what value of t would make the two arrangements for production equivalent in terms of cost