The molecular formula of a crystal is $AB_2O_4$. Oxygen atoms form $ccp$ lattice. Atoms of $A$ occupy $x \%$ of tetrahedral voids and atoms of $B$ occupy $y \%$ of octahedral voids. $x$ and $y$ are respectively:
- A$12.5 \%, 50 \%$
- B$50 \%, 12.5 \%$
- C$33.3 \%, 66.6 \%$
- D$66.6 \%, 33.3 \%$
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