Find the missing term in the following number series- 1420 1400 720 ? 75 -5

The sequence: 1420, 1400, 720, ?, 75, -5. Differences: -20, -680. Next differences don't clearly follow. Pattern may be: subtract 20, subtract 680, subtract ? Actually: 1400/1420 ≈ 0.986, 720/1400 = 0.514. Not consistent. Alternative: 1420 - 20 = 1400, 1400 - 680 = 720, 720 - 500 = 220, 220 - 145 = 75, 75 - 80 = -5. This fits option C (220). The differences (20, 680, 500, 145, 80) don't follow a clear pattern, but 220 gives the correct subsequent terms.