Steve's scores on exams #1, #2 and #4 are 89, 93, and 87 (out 0f 100). unfortunately he skipped exam #3. this resulted in a score of 0 for him on exam #3. if he has to get a passing grade of at least 70% to go on to the next class, and he has only exam #5 left in the class, what is the minimum score he needs to get on exam #5? assume his grade is calculated using only 5 exam scores.