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### Given:
- Last year, there were:
  - 125 ninth graders on the honor roll.
  - 100 tenth graders on the honor roll.
- This year, the number of:
  - Ninth graders on the honor roll decreased by 4%.
  - Tenth graders on the honor roll decreased by 11%.

### Step 1: Calculate the number of ninth and tenth graders after the decrease.
- For ninth graders:
  \[
  125 \times (1 - 0.04) = 125 \times 0.96 = 120
  \]
  So, there are 120 ninth graders this year.
  
- For tenth graders:
  \[
  100 \times (1 - 0.11) = 100 \times 0.89 = 89
  \]
  So, there are 89 tenth graders this year.

### Step 2: Calculate the total number of students last year and this year.
- Last year:
  \[
  125 + 100 = 225
  \]
- This year:
  \[
  120 + 89 = 209
  \]

### Step 3: Calculate the total decrease in students.
\[
225 - 209 = 16
\]

### Step 4: Calculate the percentage decrease.
\[
\left(\frac{16}{225}\right) \times 100 = 7.11\%
\]

### Final Answer:
The total number of students on the honor roll decreased by **7.1%**.

Would you like any further details or clarifications?

Here are 5 related questions:
1. How would the answer change if the number of ninth graders decreased by 6% instead of 4%?
2. What would the total percentage decrease be if the tenth graders' number decreased by 15%?
3. How can we use the formula for percentage change in other scenarios?
4. If the school wanted to increase the total number of students by 10%, how many more students would need to be on the honor roll?
5. How does the percentage decrease compare when the initial number of students is higher or lower?

**Tip:** When dealing with percentage changes in multiple groups, always calculate the individual group changes before combining them to get the total change.

Last year at a certain high school, there were 125 ninth graders on the honor roll and 100 tenth graders on the honor roll. This year, the number of ninth graders on the honor roll decreased by 4% and the number of tenth graders on the honor roll decreased by 11%. By what percentage did the total number of students on the honor roll decrease? Round your answer to the nearest tenth (if necessary).

Solve the honor roll percentage decrease problem involving ninth and tenth graders, where the number of ninth graders decreased by 4% and tenth graders decreased by 11%. Calculate the total percentage decrease in students.

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