A solid sphere of radius 2cm of bulk modulus $2\times 10^6N/m^2$ is surrounded by a liquid in cylindrical container.A massless piston of area $100cm^2$ floats on the surface of the liquid.When a mass 30Kg is placed on piston to compress the liquid what is fractional change in the radius of sphere

Question

$\begin{array}{1 1}(A)\;2\%\\(B)\;.5\%\\(C)\;1\%\\(D)\;3\%\end{array}$