Normal mark-up on a discounted item?

**A store sells a TV at a 25% discount but still makes a gross profit of 25% of the cost. What is the normal mark-up (i.e. profit without the discount)??**

I think the answer is 50% but I can figure out how to rationally set the problem up to get this answer.

Is there an alternative method?

I do get this method of solving the problem...but I am just wondering if you have another way to solve the problem.

I think I would have a tough time solving a similar equation. If not, then that is fine...just trying:-)