Answer:
$88,000
Explanation:
We know that
The operating profit = Revenues - cost
                 = $2,600,000 - $2,100,000
                 = $500,000
If there is increase, so the operating profit would be
= Revenues - cost
where
Revenues = $2,600,000 + $260,000
         = $2,860,000
Cost = $2,100,000 + $172,000
    = $2,272,000
So, operating profit is
= $2,860,000 - $2,272,000
= $588,000
So, the increase in operating profit would be
= $588,000 - $500,000
= Â $88,000