Complete combustion of 1.80 g of an oxygen containing compound $\left(\mathrm{C}_x \mathrm{H}_y \mathrm{O}_z\right)$ gave 2.64 g of $\mathrm{CO}_2$ and 1.08 g of $\mathrm{H}_2 \mathrm{O}$. The percentage of oxygen in the organic compound is:
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