$4$ A manager checked production records and found that a worker produced $180$ units while working $40$ hours. In the previous week, the same worker produced $144$ units while working $35$ hours.

a$.$ Calculate the labour productivity in the current week and the previous week? $($Round the final answers to $2$ decimal places.$)$

Labour Productivity

$\backslash$table$[[$Current week, units per hour$],[$Previous week, units per hour$]]$

b$.$ Did the worker's productivity increase, decrease, or remain the same?

Worker's productivity

increase