In an experiment on a simple pendulum, the string length from the suspension point to the top of the bob is measured as 90.0 cm with a metre scale of…

In an experiment on a simple pendulum, the string length from the suspension point to the top of the bob is measured as $90.0\ \mathrm{cm}$ with a metre scale of least count $0.1\ \mathrm{cm}$. The bob diameter, measured with a vernier calliper of least count $0.01\ \mathrm{cm}$, is $2.00\ \mathrm{cm}$. The time for $30$ oscillations is $57.2\ \mathrm{s}$ with a stopwatch of least count $0.1\ \mathrm{s}$. Taking the maximum possible errors to be the least counts, the percentage error in the value of $g=4\pi^2L/T^2$ (with $L$ the effective length) is. Give the answer correct to two decimal places.