To calculate the discount amount on the $135 computer monitor with a 25% off coupon, you can use the following steps:
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Convert the percentage to a decimal: 25% = 0.25.
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Multiply the original price by the decimal:
\[ \text{Discount Amount} = \text{Original Price} \times \text{Discount Rate} \]
\[ \text{Discount Amount} = 135 \times 0.25 = 33.75 \]
So, the discount amount is $33.75.