What is the significance of the 0/100 rule and the 50/50 rule and why would each be used?

What will be an ideal response?

The 0/100 rule and the 50/50 rule are both techniques for assigning a completion value to activities in a project. A completion value for every activity is a vital piece of information when applying earned value management analysis. The 0/100 rule says that an activity is 0% complete until it is finished, at which time it is 100% complete. The 50/50 rule says that once an activity has been started, it is assigned a value of 50% complete until it is completed, at which time it is 100% complete. Both rules are easy to apply; rather than trying to estimate a precise completion percentage, the project manager or subcontractor needs only supply one of two numbers. These rules are appropriate when work packages are short or are of a nature that vendor deliveries are required.