At Symtecks, the output of a specific process is val$-$

ued at $$100$ per unit. The cost of labor is $$50$ per hour

including benefits. The accounting department provided

the following information about the process for the past

four weeks:

a$.$ Use the multifactor productivity ratio to see whether

recent process improvements had any effect and, if

so$,$ when the effect was noticeable.

b$.$ Has labor productivity changed? Use the labor pro$-$

ductivity ratio to support your answer.