1. **State the problem:** Omar's available credit is the remaining credit line after accounting for his previous balance, late fee, new purchases, and interest charged. 2. **Identify the formula:** Available credit = Credit line - (Previous balance + Late fee + New purchases + Interest) 3. **Substitute the values:** Credit line = 2000 Previous balance = 550.25 Late fee = 35 New purchases = 765.45 Interest = 25.75 4. **Calculate the total amount owed:** $$550.25 + 35 + 765.45 + 25.75 = 1376.45$$ 5. **Calculate available credit:** $$2000 - 1376.45 = 623.55$$ 6. **Explain:** Omar has $623.55 of his credit line still available after all charges. **Final answer:** $$\boxed{623.55}$$