Two elements ' $P$ ' and ' $Q$ ' combine to form a compound. Atomic mass of ' $P$ ' is 12 and ' $Q$

Question

Two elements ' $P$ ' and ' $Q$ ' combine to form a compound. Atomic mass of ' $P$ ' is 12 and ' $Q$ ' is 16 . Percentage of ' $P$ ' in the compound is 27.3. What will be the empirical formula of the compound?\

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(d) :