The population of a town is 20000

The population of a town is 20000. It decreases annually at the rate of 20% p.a. What will be its population after 2 years?

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 #3515