A manufacturer has the following figure for the product A Original Data Increase Variable Cost to ＄15 Unit selling 30 30 Unit va

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问题 A manufacturer has the following figure for the product A
Original Data Increase Variable Cost to ＄15
Unit selling 30 30
Unit variable cost 10 15
Fixed cost 3,000 3,000
Budget selling units 300 300
Margin of safety is ______.

选项 A、increase 50 units
B、increase 100 units
C、decrease 50 units
D、decrease 100 units