Table. Present value of estimated costs & negative effects
Alternatives
State of nature Probability Steel alloy    Trestle bridge        Bridge w/risk
0 storm 0.60 $191,524         $182,658 $109,595          
1 storm 0.31 $191,524         $222,268 $68,903
2 storms 0.08 $191,524        $222,268 $17,781
3 storms 0.01 $191,524        $282,072  $2,821
Expected value
(costs +negative effects                     $191,524                    $199,100