A company is considering entering into a new marketing campaign. If it engages in this marketing campaign, it must pay $$7,000$ immediately and $$5,000$ each at the end of year $1$ and year $2.$ The company believes its annual revenues due to the marketing campaign will be $$9,000$ at the end of year $1,$ $$7,000$ at the end of year $2,$ and $$4,000$ at the end of year $3.$ What is the annual equivalent worth of this marketing campaign over the next three years? The interest rate is $6\mathrm{.}4\%$ compounded annually.