Sarah now has an equity percentage of roughly 16.6% ($2,000 / $12,000). This is below the required 25% maintenance margin. At this precise moment, the broker triggers a margin call.
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To get back to 30% equity, the math is: Required Equity = Market Value x 0.30 = $21,000 x 0.30 = $6,300. Current Equity = $6,000. Deficit = $300. Sarah now has an equity percentage of roughly 16