Professor Betti teaches two section of business statistics, which combined will result in 120 final exams to be graded. Professor Betti has two graduate assistants. Felix and Sarah, who will grade the final exams. There is a 3-day period between the time the exam is administered and when final grades must be posted. During this period Felix has 12 hours available and Sarah has 10 hours available to grade the exams. it takes Felix an average of 7.2 minutes to grade an exam, and it takes Sarah 12 minutes to grade an exam; however, Felix's exam will have errors that will require Professor Betti to ultimately regrade 10% of the exams, while only 6% of Sarah's exams grade in order to minimize the number or exams to regrade.

formulate a linear programming model for this problem and solve.

anyone can help me solve this problem?