Answer: 39.00%
Explanation:
First, you need to calculate your grade in percentages. The total answers count 200 - it's 100%, so we get a 1% value, divide 200 by 100 to get 2.00. Next, calculate the percentage of 78: divide 78 by 1% value (2.00), and you get 39.00% - it's your percentage grade.