If a sum on compound interest becomes three times in 4 years…

If a sum on compound interest becomes three times in 4 years, then with the same interest rate, the sum will become 81 times in:

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 #35088