please write out the function for answer

B C E F H only differentiate between those who get A and those who do not ("Not A") provide letter grade based on the percent score 1 2 3 Cutoff Letter Values Grade 0.0% F 60.0%D 70.0% C 80.0% B 90.0% A 4 5 6 7 8 9 10 11 12 13 14 Student ID 723800 640071 168435 588368 660214 286923 213264 227477 690209 178328 232434 769560 600369 322163 724799 479850 693746 535107 298502 875125 324865 736643 214971 880789 109401 850174 Percent Score 90% 78% 76% 87% 93% 80% 64% 91% 78% 82% 76% 67% 80% 73% 58% 60% 80% 76% 83% 71% 91% 82% 58% 69% 88% 80% 15 16 17 18 19 20 21 22 23 24 25 26 27 28