These questions are based on the following information.
The entrance examination of Satyam Infoway Ltd to recruit fresh engineers had a total of 300 questions. Each correct answer carried 2 marks and each wrong answer would result in a candidate losing 2 marks. The net score of each student was positive. A total of 80 candidates took up the exam, and their total marks were 2800. No candidate answered all the questions correctly and each candidate attempted all questions.
If no two candidates got the same marks, what could be minimum difference between the highest and lowest scores?