1. A student raises her grade average from a 75 to a 90. What was the percent of increase in the student’s grade average? Round your answer to the nearest tenth of a percent, if necessary.
A: 20%
B: 16.7%
C: 8.3%
D: 15%
i think it is 20 am i right
you are correct
(90 - 75) / 75 = 20%
I am quoting this from a website: "To calculate percentage decrease: First: work out the difference (decrease) between the two numbers you are comparing. Then: divide the decrease by the original number and multiply the answer by 100. If your answer is a negative number then this is a percentage increase." I believe this will help you out.
no @PsyDAG, @R_Scott is right
To find the percent of increase in the student's grade average, we need to calculate the difference between the new grade average and the old grade average, and then divide that difference by the old grade average. Finally, we multiply the result by 100 to express it as a percentage.
1. Calculate the difference between the new grade average and the old grade average: 90 - 75 = 15
2. Divide the difference by the old grade average: 15 / 75 = 0.2
3. Multiply the result by 100 to express it as a percentage: 0.2 * 100 = 20
Therefore, the percent of increase in the student's grade average is 20%. So, the correct answer is A: 20%.