A man sells an article at 15% loss

A man sells an article at 15% loss. Had he sold it for Rs. 140/- more he could have gained 20%. What is the cost price of the article?

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 #52205