Instead of multiplying a number by 2, the number is divided by…

Instead of multiplying a number by 2, the number is divided by 10. What is the percentage of error obtained ?

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 #6205