To find out how many dozen donuts the junior class needs to sell to make at least $1,000, we can set up an inequality.
Let \( x \) represent the number of dozens of donuts sold. Each dozen is sold for $12. We want to find the number of dozens, \( x \), such that the total revenue from selling \( x \) dozens is at least $1,000.
The inequality will be: \[ 12x \geq 1000 \]
Now, we can solve for \( x \):
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Divide both sides by 12: \[ x \geq \frac{1000}{12} \]
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Simplifying the right side: \[ x \geq 83.33\ldots \]
Since they cannot sell a fraction of a dozen, we round up to the nearest whole number. Therefore, they need to sell at least 84 dozens of donuts.
Solution: The junior class needs to sell at least 84 dozen donuts to make at least $1,000.