I'm a newbee... that needs help to solve what is probably a simple solution.

From the project list (below) I need to select those projects that will collectively optimize a payback of <2.

Save Cost Payback
$6,529.54 $16,273.66 2.492315534
$7,498.08 $11,419.03 1.522925978
$1,620.96 $8,606.71 5.309644576
$2,448.58 $6,102.62 2.492315534
$843.40 $2,812.14 3.334293892
$81.62 $1,800.96 22.06539638
$258.46 $788.96 3.052532531
$189.41 $690.03 3.643160492
$116.31 $691.44 5.94493762
$193.85 $591.72 3.052532531
$122.43 $562.62 4.595467733
$136.03 $453.57 3.334293892
$13.60 $468.85 34.466008
$192.83 $343.08 1.779201657
$174.12 $307.31 1.764903356