The price of a book is increased from $300 to $330

The price of a book is increased from $300 to $330. What is the % of increase in its price?

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 #38348