The inequality that represents the number of backpacks to sell is $30x - $10x - 10,000 ≥ 1000
The number of backpacks the factory must sell in order to meet its weekly goal is 550.
Here are inequality signs and what they mean:
Profit is total revenue less total cost.
Profit = total revenue - total variable cost - operating expense
$30x - $10x - 10,000 ≥ 1000
$20x ≥ 11,000
x ≥ 11000 / 20
x ≥ 550
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