A manager checked production records and found that a worker produced $156$ units while working $40$ hours. In the previous week, the

same worker produced $99$ units while working $30$ hours.

a$.$ Compute Current period productivity and Previous period productivity. $($Round your answers to $2$ decimal places.$)$

b$.$ Did the worker's productivity increase, decrease, or remain the same? $($Round your intermediate calculations and final answer to $2$

decimal places.$)$