Your first clue that you might get screwed over is that your school is charging $50K for an associates degree. An associates degree should cost $3K-$15K.
Raw percentages mean little. A 90% in one program might be the equivalent of a 75% in another program. It depends how hard the questions are. It is likely your school is keeping a high percentage cutoff in order to ensure students pay their tuition but are unable to sit for NCLEX because they want to keep their pass rates high enough that their state BON doesn't revoke the schools accreditation. That is the problem with choosing a for-profit institution.
Work hard enough to meet their standards so that you don't end up in debt with no degree. I just hope your program gets you clinical in acute care settings because around here plenty of for-profit grads cannot get jobs because they did most or all of their clinicals in LTC, LTAC, and outpatient clinics.