The cost price of an article is 25% of the marked price

The cost price of an article is 25% of the marked price. Calculate the gain percent after allowing a discount of 50%.

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #66618