The project's schedule performance index (SPI) can be found by using the formula; earned value/planned value. The earned value is the percent of the project completed times the BAC. The planned value is the percentage of where the project should be times the budget at completion. In this instance, the formula reads: $450,000/562500 = 0.80. Schedule performance index (SPI) is the measure of schedule efficiency on a project. It is used in trend analysis to predict future performance. SPI is the ratio of earned value to planned value. The SPI is calculated based on the following formula: SPI = Earned Value (EV) / Planned Value (PV) If the SPI value is greater than 1, it indicates better than expected performance, whereas if the value is less than 1, it shows poor performance. The SPI value of 1 indicates that the project is right on target.

Answer option A is incorrect. This value is the project's Cost Performance Index (CPI).

Answer option D is incorrect. This value is the schedule variance for the project.

Answer option C is incorrect. $562,500 is the planned value for the project.