Final answer:
The unused capacity in terms of the number of orders processed is 9,000 orders.
Step-by-step explanation:
To determine the unused capacity in terms of the number of orders processed, we need to calculate the total number of orders that can be processed by the 11 assemblers. Each assembler can process 19,000 orders in a year, so the total capacity of the assemblers is 11 * 19,000 = 209,000 orders. However, only 200,000 orders were processed last year. Therefore, the unused capacity is 209,000 - 200,000 = 9,000 orders.