A towel, when bleached, lost 10% of its length and 20% of…

A towel, when bleached, lost 10% of its length and 20% of its breadth. What is the percentage decrease in area?

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 #939