Khan/khan-exercises — pull request #12427 by clkirby1 (2012-01-30 05:04:26+00:00)
Title: Add exercise: converting fractions and mixed numbers to percents

This is one of the exercises on the spreadsheet, https://docs.google.com/spreadsheet/ccc?key=0AtCSfczlwTqgdDFCYVJnd0M3QWI1NmZYSFdETlBJa3c#gid=0

Changes have also been made to answer-types.js in order to properly validate the percents (see issue #11975).