Answer:
Discount: $10
Price: $30
Explanation:
There's a few different ways to approach this but here's the way i'd use...
25% can also be expressed as 1/4. This means that we can divide the price of the dress by 4 to find the discount.
40 / 4 = 10.
The discount is $10
To find the sales price of the dress, we just need to subtract the discount.
40 - 10 = 30.
The dress costs $30