A rectangular container contains water to a depth of 50cm and above water there is a 20cm thick layer of oil of specific gravity 0.8. Then pressure of the bottom of container is

• A

  $12.4\mathrm{K}{\mathrm{P}}_{\mathrm{a}}$

• B

  $106.6\mathrm{K}{\mathrm{P}}_{\mathrm{a}}$

• C

  $18.6\mathrm{K}{\mathrm{P}}_{\mathrm{a}}$

• D

  $22.5\mathrm{K}{\mathrm{P}}_{\mathrm{a}}$