Gonna be easy

The period of oscillation of a simple pendulum is \(T=2\pi \sqrt{\frac{L}{g}}\). Measured value of \(L\) is \(20cm\) known to \(1mm\) accuracy and time for \(100\) oscillation is found to be \(90s\) using a wristwatch of \(1s\) resolution. The accuracy in determination of \(g\) is:

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