4. Machine A costs $11,500 and has an annual operating cost of ($3000+$100g). At the end of its 10-yr life, it has a salvage value of $1500. Machine B costs $15,000 and has an annual operating cost of ($1200+200g). At the end of its 10-yr life, it has a salvage value of $4000. At 8% interest, what is the annual net equivalent advantage of the additional investment in machine B? g=2