A fruit-seller buys $x$ guavas for $Rs.\, y$ and sells $y$ guavas for $Rs.\, x .$ If $x>y,$ then he made

  • A

    $\frac{x^{2}-y^{2}}{x y} \% \operatorname{loss}$

  • B

    $\frac{x^{2}-y^{2}}{x y} \%$ gain

  • C

    $\frac{x^{2}-y^{2}}{y^{2}} \% \operatorname{loss}$

  • D

    $\frac{x^{2}-y^{2}}{y^{2}} \times 100 \%$ gain

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