Percentage error is calculated by subtracting the theoretical value from the actual value, then dividing by the theoretical value, and multiplying by 100. Find the percentage error while measuring the radius of a string using screw gauge whose actual value is given by $0.25\;cm$ but the theoretical value was found to be $0.19\;cm$.

Question

$\begin{array}{1 1} (a)\; 31.5 \% \\ (b)\; 30 \% \\ (c) \; 31 \% \\ (d)\; 32 \% \end{array}$