Answer:
$165,000
Explanation:
Given that,
In 2020,
Consulting revenues = $1,197,000
Operating costs = $720,000
In 2021,
Sales revenue generated = $165,000
Operating costs = $57,000
Therefore, the differential revenue refers to the additional revenue earned or generated during an accounting period. Hence, in 2021, there is an additional sales revenue generated by the company of amount $165,000.
So, the the differential revenue for 2021 will be $165,000.