The C.P of 30 books is equal to the S.P of 40…

The C.P of 30 books is equal to the S.P of 40 books. Find his gain% or loss%?

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 #63279

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