How much time will it take for an amount of Rs

How much time will it take for an amount of Rs. 400 to yield Rs. 100 as interest at 5% per annum of simple interest?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #7279

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