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B-
12b - 9 + 2b - b = -87 13b - 9 = -87 13b = -87 +9 13b = -78 b = -6
$348 plus 25% is 348+87 = 435 dollars
In almost every case, an 87 is a B Some schools use a 10-point scale (60-70-80-90-100), which puts an 87 high in the B range. Some schools use a 7.5 point scale (70-77-85-93-100), where an 87 is a low B. ■
348