If the price decreases from 30,000 USDT to 28,000 USDT:
- Maintenance Margin: 3,000 USDT * 1% = 30 USDT
- Unrealized P&L: 0.1 BTC * (28,000 – 30,000) USDT = -200 USDT
- Remaining Margin: Initial Margin + Unrealized P&L = 300 USDT – 200 USDT = 100 USDT
Since the remaining margin (100 USDT) is greater than the maintenance margin (30 USDT), the position is not liquidated.