How much time will take for an amount of Rs

How much time will take for an amount of Rs. 200 to yield Rs. 81 as interest at 4.5% 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 #17854

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