A clean and dry sandstone core is placed in a Boyle's Law Porotimeter as shown below: Given the data; V1=100.6cc,V2=100.5ccP1=15psiP2=603pi When the valve between Chamber 1 and Chamber 2 is opened, the pressure is found to stabilize at P1=39.2 psi. If the effective pore volume (V17) is qiven as 29 cc, what is the porosity of the core sample? Express your answer in percent