Boy sells a book for Rs

Boy sells a book for Rs. 450 he gets a loss of 10 %, To gain 10 %, what should be the SP?

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 #36514