A $77.95 lawn chair was sold for $59.95 at a special sale

A $77.95 lawn chair was sold for $59.95 at a special sale. By approximately what percent was the price decreased?

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 #53010