1. If, at a nominal annual interest rate of 11 percent (but with monthly compounding), the present value of the following cash flow stream is 18,000, what is the value of $X (i.e., some "unknown" amount)? Note: $X is the same amount for each of the missing years Cash Flow $1000 $1000 $2000 $2000 $2000 $2000 $3000 $3000 $3000 SX SX $5000 SX $5000 $5000 Year 4 10 12 13