A municipality has just spent $8 million to build a second bridge across the city river to handle the increased traffic between the banks. City engineer calculated that the bridge allows to reduce travel time for the road users by $15.5 million over the 25-year period of the service life of the bridge calculated in terms of today's dollars. The construction also leads to a decrease in the value of surrounding property by $6.4 million over the service life in terms of today's dollars. The bridge requires $3.5 million for operation and maintenance over its service life in terms of today's dollars. What is the benefit-cost ratio of the project?