To determine at which price profits are minimized, we need to calculate the profits for each quantity sold. Profit can be calculated as:
\[ \text{Profit} = \text{Total Revenue} - \text{Total Costs} \]
Where Total Revenue is calculated as:
\[ \text{Total Revenue} = \text{Price} \times \text{Quantity Sold} \]
Now, let's calculate the profits for each price point:
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For 20 units at $20:
- Total Revenue = \( 20 \times 20 = 400 \)
- Total Costs = 150
- Profit = \( 400 - 150 = 250 \)
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For 25 units at $18:
- Total Revenue = \( 25 \times 18 = 450 \)
- Total Costs = 180
- Profit = \( 450 - 180 = 270 \)
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For 30 units at $16:
- Total Revenue = \( 30 \times 16 = 480 \)
- Total Costs = 200
- Profit = \( 480 - 200 = 280 \)
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For 35 units at $14:
- Total Revenue = \( 35 \times 14 = 490 \)
- Total Costs = 225
- Profit = \( 490 - 225 = 265 \)
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For 40 units at $12:
- Total Revenue = \( 40 \times 12 = 480 \)
- Total Costs = 250
- Profit = \( 480 - 250 = 230 \)
Now, let's summarize the profits calculated:
- At $20: Profit = 250
- At $18: Profit = 270
- At $16: Profit = 280
- At $14: Profit = 265
- At $12: Profit = 230
From these calculations, we can see that the lowest profit occurs at the price of $12.
Thus, the answer is a. 12.