Answer
90, 91, 92, and 93
Work Step by Step
$87, 89, 81, 85, 87, 83, 86, 94, 90, 97, 80, 89, 85, 88$
$80, 81, 83, 85, 85, 86, 87, 87, 88, 89, 89, 90, 94, 97$
$80% = 8/10$
$8/10 = .8$
$.8*15 = 12$
12 of the 15 scores are under 90, so that would be our score. 91, 92, and 93 are also possible scores since there would be only two scores higher (making ours the third-highest).