The freeway authority is considering the option of building flyover in a busy road to solve the traffic problem. The cost of construction is expected to be 24517k dollars, annual operation and maintenance cost 23k dollars which is expected to increase by 0.89k from the 10^th year onward and zero salvage value. The flyover is having a life of 25 years. Easing of traffic is expected to contribute 1000k per annum to the local economy which is expected to increase at a rate of 12% from the 5^th year onward. What is the present worth of the alternative?