Continental Long Distance Telephone Service offers an optional package for in-state calling whereby each month the subscriber

Question:

Continental Long Distance Telephone Service offers an optional package for in-state calling whereby each month the subscriber gets the first 50 min of in-state calls free, the next 100 min at $0.25/min, and any additional time at the normal rate of $0.50/min. Draw the budget constraint for in-state phone calls and the composite good for a subscriber with an income of $400/mo.