Find the present worth of the following cash flow: $3,000 (Constant-value dollars) at year 1, $6,000 (Future dollars) at year 2, $8,000 (Future dollars) at year 3, $4,000 (Constant-value dollars) at year 4, and $5,000 (Constant-value dollars) at year 5. Assume a real interest rate of 5.8% per year and an inflation rate of 6% per year