By selling 100 pencil, a trader gains the cost of 33 Pencil

By selling 100 pencil, a trader gains the cost of 33 Pencil. Find his gain percentage?

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 #36715