A student recorded the mass of dry raisins as $2.5\;g$ and the mass of raisins after soaking in water as $4 \;g$ . While performing the above experiment. The percentage of water absorbed by raisin is :

Question

$\begin{array}{1 1} (a)20\% \\ (b)30 \% \\ (c)60 \% \\ (d)40\% \end{array} $