A single discount equivalent to the discount series of 20%, 10% and…

A single discount equivalent to the discount series of 20%, 10% and 5% is?

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 #8332