Astore sells for 25% off the regular price the regular price of a beach towel is 24.50 which expression represents the scale price

Since you're adding on to the regular price, you can say it is 125% of the price. Or you can use the regular equation:

Since you're only finding 25% of 24.5, you have to add on 24.5 because you're paying for the beach towel and applying the sales tax.

Now, since cents are to the hundredths place, you have to round.
The final price would be $30.63