the correct percentage should be :

来源: 于 2012-01-16 07:42:40 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

$15/80K = 18.75, not 30% and she/he should contribute 80K/24 = 3333 * 18.75 = 624.99 a pay period.