Carbondale Casting produces cast bronze valves on a $12-$person assembly line. On a recent day, $180$ valves were

produced during a $4-$hour shift.

a$)$ Labor productivity of the line $=$ valves$/$labor hour $($round your response to two decimal places$).$

b$)$ John Goodale, the manager at Carbondale, changed the layout and was able to increase production to $200$ units

per $4-$hour shift. The new labor productivity $=$ valves$/$labor hour $($round your response to two decimal places$).$

c$)$ The percentage of productivity increase $=\%($round your response to one decimal place$).$

Time Remaining: $01$:$10$:$59$