You are performing economic analysis of the project $($life span of $20$ years$),$ which have three alternatives $($Table below$).$ Assume benefits for each alternative are equal. Select the best alternative considering interest rate of $6\%(20$ points$).$

$\backslash$table$[[,$Construction cost $($$$)],[$Years$,$Project I,Project II$,$Project III$],[0,3000,2000,1000],[10,0,0,1000],[20,0,1000,1000],[,$O & M cost $($$$)],[0$ to $10,1000,1200,1200],[10$ to $20,1200,1300,1500]]$