Construction costs of a bridge between A and B were $500 million. In its lifetime the bridge will have 750million crossings, so that the construction cost per crossing is 5/7.5 = $2/3.
if one additional croosser adds almost nothing to the maintenance of the bridge or does not cause any incomvenience to ohter cars,there should not be any toll for the poeple crossing the bridge once the bridge is built. When another bridge is needed between A and C,how are you going to finance the construction of the bridge if there will be no toll after completion?

이건데요 정말로 새 다리 비용을 어떻게 댈지 물어보는건지 앞의 논리를 까라고 하는건지 감이 안잡혀요 ㅠㅠ
고수님들 부탁드립니다