A person earns $15 \%$ on investment but loses $10 \%$ on another investment. If the ratio of the two investments be $3: 5,$ what is the gain or loss on the two investments taken together in $\%$?

  • A

    $0.625$

  • B

    $0.8$

  • C

    $0.9$

  • D

    $1.2$

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