edx/edx-platform — pull request #3489 by jmclaus (2014-04-28 12:51:08+00:00)
Title: Tolerance expressed in percentage now computes correctly. [BLD-522]

@auraz @valera-rozuvan It fixes the issue, tested it with -100 +- 10%; 100 +- 10%; 0 +- 10%; 10 +- 100%; -10 +- 100%. I guess we should add tests.