1. **State the problem:** Calculate Carmela's percent score given she obtained 618 marks out of 800 total marks. 2. **Formula used:** Percent Score = \(\frac{\text{Marks obtained}}{\text{Total marks}} \times 100\) 3. **Substitute the values:** \(\frac{618}{800} \times 100\) 4. **Calculate the fraction:** \(\frac{618}{800} = 0.7725\) 5. **Multiply by 100:** \(0.7725 \times 100 = 77.25\) 6. **Final answer:** Carmela's percent score is \(77.25\).