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