The details that show sound reasoning in support of the argument regarding unfair entertainment fees for young people between the ages of twelve and seventeen are:
- The author states that the extra money needed to pay the adult price is "hard to come by."
- The author states that "an adult ticket costs at least a third more than" a child's ticket.
- The author states that matinees have lower prices, but there is still "injustice" in having to pay adult prices at other times.
These points highlight the financial burden on young people and the perceived inequity in ticket pricing based on age. The fourth statement about rates for "people over the age of fifty-five" being lower than children's rates indicates further inconsistency in pricing but might not directly support the specific argument about unfair pricing for ages twelve to seventeen.