Merge pull request #25295 from ErikWaters/ewaters/demox-code-grader

Correct DemoX Code Grader solution

common/test/data/manual-testing-complete/problem/c2ee6e8917fe4c97ac99d7b616ff0b89.xml

@@ -73,7 +73,7 @@ while abs(balance) > .02:
 
 # When the while loop terminates, we know we have 
 #  our answer!
-print "Lowest Payment:", round(payment, 2)
+print ( "Lowest Payment:", str( round(payment, 2) ) )
 </answer_display>
       <grader_payload>
 {"grader": "ps02/bisect/grade_bisect.py"}