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

First

O&M

Cost Cost$/$year Salvage

Life

A $$18$M

$$5$M

$$4$M

$10$ years

B

$25$M

$3$M

$6$M

$20$ years