Residents in the estate have become increasingly vocal in their demand to change roads AV and VE from one-way to two-way roads. They claim that this will alleviate all the problems of access to some of the streets. The local council has resisted this idea because the cost of changing each road from one-way to two-way will be approximately $200 000. The direction of one-way streets can be reversed at a cost of only $20 000. Find the most cost-effective way by changing the direction of one road only, such that all vertices can be reached from any point within the network.