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A circular disc of mass $M$ and radius $R$ is rotating about its axis with angular speed $\omega_1$. If another stationary disc having radius $\frac{R}{2}$ and same mass $M$ is dropped co-axially on to the rotating disc. Gradually both discs attain constant angular speed $\omega_2$. The energy lost in the process is $p%$ of the initial energy. Value of $p$ is __________.
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