Percentage = (Points earned / Total points) x 100
Percentage = (133 / 200) x 100
= 0.665 x 100
= 66.5%
Now, let's determine the grade based on the percentage:
- 90% and above: A
- 80% to 89%: B
- 70% to 79%: C
- 60% to 69%: D
- Below 60%: F
Based on the calculation, 66.5% corresponds to a D grade.