Soft drink stand problem
Suppose that soft drink stands are located at points B and D along a beach of length AE. Equilibrium beachgoers to the left of C will buy from stand B, while beachgoers to the right of C will buy from stand D. Points B and D are equidistant from C, and the distance between points C and D is X. The distance between points C and E is Y.
Assume that beachgoers are located uniformly along the beach, one beachgoer per unit of distance. Each beachgoer buys one soft drink per period. The cost to the beachgoers of carrying the soft drink back to their location is zero, but the cost of producing the soft drink is 10 cents per unit of distance walked (because the soft drink gets warm). The beach is 100 meters long (AE = 100 meters).
If the distance X is 40 meters and the distance Y is 10 meters, what price should stand B charge to maximize profit, and what price should stand D charge?