I need help in these questions. Please do it 100%

What is your SPI if your CV is $20,000, your SV is $12,000, and your PV is $400,000? And how do you interpret the SPI value? SPI=EV/PV 8. Given the following demand data: Period Demand 62 50 73 50 55 Compute a weighted average forecast using a weight of 0.45 for the most recent period, 0.35 for the next most recent, 0.25 for the next, and 0.15 for the next. F, =w.4-,+W.-14-(n-1) +...+w; 4-1 where w, = weight for period t, W-1 = weight for period 1-1, etc. 4, = the actual value for period t, 4- = the actual value for period t -1, etc