The parks district wants to put up a new playground in the l…

The parks district wants to put up a new playground in the local park in a three-family town. The marginal benefit for Jim would be $500; the marginal benefit for Jake would be $200. The marginal benefit for Connor, who has six children, would be $2,000. The total cost of putting in the swing set is $1,400 and each family needs to pay an equal amount. With no vote trading allowed, how many families would vote for this playground?