You have been offered the opportunity to invest in a project which is expected to provide you with the following cash flows: $4,000 in 1 year, $12,000 in 2 years, and $8,000 in 3 years. If the appropriate interest rates are 6 percent for the first year, 8 percent for the second year, and 12 percent for the third year, what is the present value of these cash flows?