**Q475.** This is one of a series of problems (469, 470, 471, 472, 473, 474, 476, 477, 478) relating to the same fictional case: The community of Ourville which is considering some options for creating parks to enhance the quality of life of local residents. The amounts are expressed in simple numbers – e.g., $100 – which you can assume to be referring to realistic amounts – e.g., hundreds of thousands.

Activists in Ourville force the city not to think of this as an either/or proposition. Experts are consulted and the following cost benefit information is obtained. Council allocates $200 for the parks project. How do you recommend they proceed and why? What kind of problem is this? How big should each park be?

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