Answer:
a. 2 ornaments per hour
b. 2.5 ornaments per hour
c. 25% increase
Step-by-step explanation:
In Susan's business, the productivity is given by the amount of ornaments she can produce in one hour.
a. If she produces 16 ornaments in 8 hours, her productivity is:

Productivity is 2 ornaments per hour.
b. If she produces 20 ornaments in 8 hours, her productivity is:

Productivity is 2.5 ornaments per hour.
c. The percent change in productivity is given by the change in productivity divided by the original productivity:

Productivity increased by 25%.