Project B is selected first, and its cost is divided proportionally to the values that the voters assigned to the project. In this case, this means it is divided equally among the voters from the first and the second group. Each such voter pays $2, and for those $2 they get the utility of 30. Thus the maximal payment-per-utility equals '"`UNIQ--postMath-00000031-QINU`"'. If a different project was selected, the maximal payment-per-utility would be higher.