$5-38$ Which process line should be built for a new chem$-$

A ical? The expected market for the chemical is $20$ years. A $20\%$ rate is used to evaluate new process facilities, which are compared with present worth. How much does the better choice save?

$\backslash$table$[[,$First,O&M$],[,$Cost$/$year$,$Salvage,Life$],[$A$,$$$18$M$,$$$5$M$,$$$4$M$,10$ years$],[$B$,25$M$,3$M$,6$M$,20$ years$]]$