To find the percentage discount, use the formula:
\[ \text{Percentage Discount} = \left( \frac{\text{Original Price} - \text{Discounted Price}}{\text{Original Price}} \right) \times 100 \]
In this case, the original price is $150 and the discounted price is $120.
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Calculate the discount amount: \[ \text{Discount Amount} = 150 - 120 = 30 \]
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Insert the values into the percentage discount formula: \[ \text{Percentage Discount} = \left( \frac{30}{150} \right) \times 100 \]
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Calculate: \[ \frac{30}{150} = 0.2 \] \[ 0.2 \times 100 = 20% \]
Thus, the percentage discount is 20%.
The correct answer is C: 20%.