A carbon steel heat exchanger costs $140,000 and is expected to have a service life of 5 years before it requires replacement. If type 304 stainless steel is used, the cost and service life will increase to $182,000 and 10 years, respectively. From the capitalized cost point of view, which exchanger is more economical if the cost of capital (i.e., interest rate) is 12%? Assume a zero salvage value for either heat exchanger