According to the question, you are required to calculate the cost performance index (CPI) of the project. Cost variance (CV) is a measure of cost performance on a project. The variance notifies if costs are higher than budgeted or lower than budgeted. The cost variance is calculated based on the following formula: CV = Earned Value (EV) - Actual Cost (AC) A positive value means that spending is less than budgeted, whereas a negative value indicates that costs are higher than originally planned for the project. Now, putting the provided values in the formula: CV = EV - AC = 320 - 400 = -80 As the value of CV (which is -80) is negative, it shows that the costs are higher than that have been planned for the project. What is BCWP (or EV)? Budgeted cost of work performed (BCWP) or Earned Value (EV) is the value of completed work. It is the budgeted amount for the work actually completed on the schedule activity during a given time period. What is BCWS (or PV)? Budgeted Cost of Work Scheduled (BCWS) or Planned Value (PV) is the authorized budget assigned to the scheduled work to be accomplished for a schedule activity or Work Breakdown Structure (WBS) component. What is ACWP (or AC)? Actual cost of work performed (ACWP) or Actual Cost (AC) is the total costs actually incurred and recorded in accomplishing work performed during a given time period for a schedule activity. It is the cost of the work to date, including direct and indirect costs. AC is money that has actually been expended to date.