If the simple interest on …40,when the time increase by 4 years

If the simple interest on $2000 increase by $40,when the time increase by 4 years. Find the rate percent per annum.

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 #61308