(i) (40 points) Determine the project's SPI, and CPI at this point (end of day 48). (ii) (25 points) Interpret the SPI and CPI by stating and explaining whether the project is doing better/worse than plan on schedule and cost. Also, forecast the actual cost (at completion) of Activity 4, assuming that its future expenditure (past day 48) is reflective of the past expenditure pattern. Activity # Duration (days) Predecessors Budget Actual Cost % Complete 1 10 NA $300 250 100 2 8 1 $400 450 100 3 6 2 $350 380 100 4 12 2 $400 400 70 5 18 3 $405 0 0 6 16 5 $480 0 0