Based on the beginning and ending Work in Process and the units completed, the Units started in August must be 12,000 tons.
This can be found by the formula:
= Units completed during August + Work in process Agust 31 - Work in process August 1
Solving gives:
= 19,000 + 2,000 - 9,000
= 21,000 - 9,000
= 12,000 tons
Find out more work in process at https://brainly.com/question/15299765.