Residents of a town take turns driving a water truck to a fire hydrant in a nearby town. They fill the truck with water and then haul it to a storage tank. Last year truck fuel and maintenance cost $3180. This year the residents are seriously considering spending $100,000 to install a pipeline from the nearby town to their storage tank. What rate of return would the residents receive on thir new water supply pipleline if the pipeline is considered to last,