A department employs 3 types of workers: laborers earning $5 per hour machine

A department employs 3 types of workers: laborers earning $5 per hour machine operators earning $9 per hour and maintenance workers earning $16 per hour. For
a certain job over 2 time periods the following data were collected:

Type of Employee Number of Labor period #1 Number of Labor for period # 2

Laborer 20 16

Machine Operator 12 16

Maintenance Worker 6 9

Output increased by 20% in period #2 compared to period #1.

a) Compute the Labor productivity ratio for each period.

b) Compute the percent change in the labor ratios.