The population of a town is 7900

The population of a town is 7900. It decreases annually at the rate of 10% p.a. What was its population 2 years ago?

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 #16637