please help solve

Calculate the Net Present Value from the following fifteen problems. 1. =$260,000YR1CF=$90,000YR2CF=$120,000YR3CF=$150,000 R=13% 2. =$1,100,000YR1CF=$300,000 YR2CF =$350,000 YR3CF = $400,000 YR4CF =$500,000R=12% 3. II =$140,000YR1CF=$50,000YR2CF=$60,000YR3CF=$70,000R .=7%. 4. il=$80,000 YR1CF =$25,000 YR2CF =$30,000YR3CF=$40,000R= 8% 5. =$80,000YR1CEE=$25,000YR2CF=$30,000YR3CF=$40,000R= 11% - 6. 11=$80;000 YR1CF =$25,000YR2CF=$30,000YR3CF=$40,000R= 5% 7.R=6%=$600,000YR1CF=$200,000YR2CF=$250,000YR3CF=$300,000 R=6% 8. =$600,000YR1CF=$200,000YR2CF=$250,000YR3CF=$300,000 R=8% 9.11=$600,000YR1CF=$200,000YR2CF=$250,000YR3CF=$300,000R=4%.10.11=$300,000YR1CF=$125,000YR2CF=$150,000YR3CF=-$180,000R=8%:*,11.11=$1,500,000YR1CF=$350,000YR2CF=$380,000YR3CF=$450,000YR4CF=$520,000R=10.50%12.11=$150,000YR1CF=$60,000YR2CF=$70,000YR3CF=$80,000R:=9%13.i=$500,000YR1CF=$180,000YR2CF=$220,000YR3CF=$250,000R=10%814.II=$800,000YR1CF=$240,000YR2CF=$280,000YR3CF=$400,000R=10.25%15.11=$2,200,000YR1CF=$500,000YR2CF=$600,000YR3CF=$750,000YRACF=$800,000R=8%