Stanford-Online/class2go — pull request #995 by jbau (2012-10-07 06:29:33+00:00)
Title: #983 multiplicative late penalty but additive penalty for retry

I tested with an exercise with 2 questions, both of which I got right after 2 attempts, so should incur 30% penalty.

Both < grace period, score 1.4
One < grace period, one > grace period but < dropdead date, score 1.05
Both > grace period but < dropdead date, score 0.7
Both > dropdead date, score 0