In earned value analysis, the 50-50 rule assumes what? Oa. 50 percent is earned when the task is half done and 50 percent is earned at completion Ob. 50 percent is earned when the task begins and 50 percent is earned at completion 50 percent is earned when the task begins and 50 percent is earned at the halfway stage Od. 50 percent is earned when the project is planned and 50 percent is earned when the project is over