Updated guided project instructions to address reported issue

Author: ChrisHowd

learn-pr/wwl-language/guided-project-arrays-iteration-selection/includes/2-prepare.md

@@ -15,7 +15,7 @@ You're developing a Student Grading application that automates the calculation o
 
     - Include extra credit assignment scores in the student's scores array.
     - Extra credit assignments are worth 10% of an exam score (when calculating the final numeric grade).
-    - Add extra credit assignment scores to the student's total exam score before calculating the final numeric grade.
+    - Add extra credit assignment scores to the student's total exam score before calculating the final numeric grade. Rounding errors are acceptable in calculations.
 
 - Your application needs to automatically assign letter grades based on the calculated final score for each student.
 - Your application needs to output/display each student’s name and formatted grade.

learn-pr/wwl-language/guided-project-arrays-iteration-selection/includes/5-exercise-implement-selection-statements.md

@@ -407,7 +407,7 @@ You will be using these extra credit scores and the application requirements pro
 1. To create the equation that adds an extra credit score to the sum, enter the following code:
 
     ```csharp
-    // add the extra credit points to the sum - bonus points equal to 10% of an exam score
+    // add the extra credit points to the sum - bonus points equal to 10% of an exam score. rounding errors are acceptable
     sumAssignmentScores += score / 10;    
     ```
 
@@ -472,7 +472,7 @@ You will be using these extra credit scores and the application requirements pro
                 sumAssignmentScores += score;
 
             else
-                // add the extra credit points to the sum - bonus points equal to 10% of an exam score
+                // add the extra credit points to the sum - bonus points equal to 10% of an exam score. rounding errors are acceptable
                 sumAssignmentScores += score / 10;
         }