Start with the evidence
Identify the source numbers, units and currency before reviewing the calculation. Keep rates and quantities distinct so an arithmetic check does not validate the wrong interpretation.
Work through the example
The example uses four hours at USD85, giving USD340. Recalculate that product and confirm that the source really describes hours rather than four fixed-price packages.
Make the next step clear
If the result differs, correct the input or reasoning and retain the checked calculation. Do not accept a new answer solely because it matches the number you expected.
Keep the source context
Doviria’s unnamed AI agent helps with accounting work, document drafts and finding information. The examples are ways to frame and review a task, not a list of guaranteed tools, autonomous actions or supported external systems.