The discount is 75% off the original price of $185.
To find the amount of the discount, we can multiply the original price by 0.75:
$185 x 0.75 = $138.75
Therefore, the dress has been discounted by $138.75.
To find the sales price, we can subtract the discount from the original price:
$185 - $138.75 = $46.25
Therefore, the sale price of the dress is $46.25.