Answer:
$819.48 more does he have to pay.
Step-by-step explanation:
As per the statement:
Mr. Grant's credit card bill was $2,684.72. If he has already paid off $1,865.24 of the amount due
⇒Total Credit card bill of Mr. Grant = $2684.72
Since, he already paid amount = $1865.24
We have to find how much more does he have to pay..

therefore, $819.48 more does he have to pay.