First, let's calculate the discount amount using the 25% off coupon.
-
25% off the regular price:
- Regular price of the dress = $45
- Discount = 25% of $45 = 0.25 * $45 = $11.25
-
$10 off any purchase of $30 or more:
- Since the regular price of $45 is more than $30, Sam can use this coupon.
- Discount = $10
Now, let's compare the two discounts:
- 25% off coupon gives a discount of $11.25
- $10 off coupon gives a discount of $10
The better incentive is the 25% off coupon which gives a discount of $11.25.
Thus, the discount amount of the better incentive is $11.25.