Radium decomposes at a rate proportional to the amount present at any time. If $P \%$ of the amount disappears in one year,then the amount of radium left after $2$ years is
- A$\left(10-\frac{P}{10}\right)^2$
- B$x_0\left[1+\frac{P}{100}\right]^2$
- C$x_0\left[1-\frac{P}{100}\right]^2$
- D$x_0\left[10-\frac{P}{100}\right]^2$
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