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Editorial: For the past two years, our dty has used photo radar to enforce speed limits at several Intersections, automatically photographing cars, measuring their speeds, and mailing tickets to offending drivers. In the second year of the program, the annual number of violations observed by photo radar dropped by 5 percent. This shows that the program has been effective at reducing speeding on the monitored streets.
The editorial's reasoning is most vulnerable to criticism on which of the following grounds?

A city's chamber of commerce has the following goal for small businesses: revenue should be at least 20% greater than costs. The Venn diagram indicates that x is the number of small businesses that both in Year 1 and in Year 2 met the goal. The diagram also indicates that 53 - x is the number of small businesses that met the goal in Year 1 but not in Year 2, and that 47 - x is the number of small businesses that met the goal in Year 2 but not in Year 1.

What is the value of x + y?
