This was a question from certchamp.

Your project has a budget of $240,000 and is expect to last for 1 year, with the work and budget spread evenly across all months. The project is now in the fourth month, but the actual work completed is 20% of the total work. What is Schedule Performance Index (SPI) in this case?

A)1.66

B)1

C)2.5

D)1.9

Can somebody explain how A is the right answer.

Thanks.