I have the answers, however I need the steps to solve then.

a$)=10\%$

b$)=$So$=59\%$

c$)=$Tight zone, $6\%$

$1\mathrm{.}22$ The following data pertain to a carbonate formation: formation thickness $=15ft$; formation water salinity $=95,000ppm$; formation temperature $=200F$; and cementation factor $=2\mathrm{.}2.$ The vertical resistivity profile of the formation is shown by Fig. $1\mathrm{.}33.$

a$.$ If Zone B is water$-$bearing, estimate its porosity.

b$.$ If Zone $A$ is an oil zone, estimate the oil saturation.

c$.$ Using qualitative and quantitative reasoning, give a complete explanation of the relatively high resistivity displayed by Zone $C$ of the formation.