2. Mr. Valdez gives his students 6 examination in each grading period. The scores of Paul's in the first 5 exams are 80, 79, 84, 87, and 93. If Paul hopes to get an average score for the 6 exams to be at least 4 marks than his average score for the first 4 exams, find the least score that he must get in the sixth exam.

2. The odoremeter, which shows the total number of kilometers a car has been driven, shows 187 569. What is the least number of additional kilometers that the car has driven, so that the odoremeter will again show a number made up of different digits?​