Which deal gives the seller a better profit per cent: a gain of 20% on a ₹500 item, or a gain of ₹90 on a ₹400 item?

Question

Accepted Answer

The ₹90 gain on the ₹400 item. ₹90 on ₹400 is 90 ÷ 400 × 100 = 22.5%, which beats 20%. (In rupees, 20% of 500 = ₹100 is more, but the question asks for per cent.)

Which deal gives the seller a better profit per cent: a gain of 20% on a ₹500 item, or a gain of ₹90 on a ₹400 item?

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