This document discusses marginal analysis in business and economics. It provides an example problem involving the demand and cost functions of producing computer sets. It asks to: (1) Express price as a function of demand, (2) Find marginal cost, (3) Find revenue function and its domain, (4) Find marginal revenue, (5) Interpret marginal revenue at two production levels, (6) Graph cost and revenue and find break-even points, (7) Find profit function, (8) Find marginal profit, and (9) Interpret marginal profit at two production levels. The solutions provide mathematical derivations and economic interpretations.