I think your question is not clear. To try to clarify it, if the original price of the item was $114.25 and it was reduced by 30%, the selling price would be approximately $80.
As you state the question, "A shirt is $80 with 30 percent off the original price. How much is the sales price?" One interpretation of "the sales price" is $80.00
If you mean: A shirt is $80 with 30 percent off the original price. How much is the ORIGINAL price?" The answer is approximately $114.25.
