To compare Gracie's and Lizzie's grades, we need to convert Gracie's score to a percentage.
Gracie earned 150 out of 200. We can calculate her percentage as follows:
\[ \text{Gracie's Percentage} = \left( \frac{150}{200} \right) \times 100 \]
Calculating this gives:
\[ \text{Gracie's Percentage} = 0.75 \times 100 = 75% \]
Now, Lizzie earned 92%.
Comparing the two percentages:
- Gracie's percentage: 75%
- Lizzie's percentage: 92%
Since 92% is greater than 75%, Lizzie has the higher grade.
Final Answer: Lizzie's grade is 92%.