6. A company has to choose one of three different assembly methods. - Method A will have a first cost of $40,000, an annual opera ve a first cost of $40,000, an annual operating cost of $9000, and a service life of 2 years. - Method B will have a first cost of $80.000 and will ha nave a first cost of $80,000 and will have an annual operating cost of $6000 over its 4-year service life. - Method C will cost $130,000 initially with an annual operating cost of $4000 to life. Methods A and B will have no salvage value, but method C will have salvage value $12,000