1. Let's clarify the context of step 3 where division by 4000 occurs. 2. Typically, dividing by 4000 in a problem might be related to converting units, normalizing a value, or calculating a rate per 4000 units. 3. For example, if you have a total quantity and want to find the amount per 4000 units, you divide the total by 4000. 4. Without the exact problem, the division by 4000 is likely to scale the value to a per-4000-unit basis, which helps in comparing or interpreting the data correctly. 5. If you provide the full problem or step 3 details, I can give a more precise explanation.