A shopkeeper marks up his goods to gain 35%. But he allows 10% discount for cash payment. His profit on the cash transaction therefore, in percentage, is
Let, cost price of the goods be 100x
As the shopkeeper marks up by 35% and gives 10% discount for cash transactions,
S.P = 90% of 135% of 100x
$$\Rightarrow$$ 0.09 $$\times$$ 1.35 $$\times$$ 100x
$$\Rightarrow$$ 121.5x i.e profit percentage = 21.5%
Hence, option C is the correct answer.
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