In an experiment to find acceleration due to gravity (g) using simple pendulum, time period of 0.5 s is measured from time of 100 oscillation with a…

In an experiment to find acceleration due to gravity (g) using simple pendulum, time period of $\displaystyle 0.5$ s is measured from time of $\displaystyle 100$ oscillation with a watch of $\displaystyle 1$ s resolution. If measured value of length is $\displaystyle 10$ cm known to $\displaystyle 1$ mm accuracy, The accuracy in the determination of g is found to be $\displaystyle x \%$. The value of $\displaystyle x$ is \_\_\_\_.