Carbondale Casting produces cast bronze valves on a $10-$person assembly line. On a recent day, $200$ valves were produced during a $4-$hour shift.

d$)$ Labor productivity of the tirne $=$

b$)$ John Goodale, the manager at Carbondale, changed the layout and was able to increase production to $220$ units per $4-$hour shift. The new labor prodi response to two decimal places$).$