please answer

Last year, a decision was made to keep the same equipment in lieu of buying new equipment. The old equipment's trade-in value last year was $4000 and its value this year is $2000. The operating cost was $700 last year. If bought last year, the new equipment would have cost $12000, the salvage value after 8 years would be $2000, and it would have an annual operating cost of $4000. Using the one year rule, what was the Total EAC for the old equipment? Assume i = 15%