Calculating pressure in a barometer

[hazar]

A gas is contained in a vertical frictionless piston-cylinder device. The piston has a mass of 4 kg and cross sectional area of 35 cm2. A compressed spring above the piston exerts a force of 60N on the piston. If the atmospheric pressure is 95 kPa, determine the pressure inside the cylinder.


how do you solve this question

 

[pukb]

assuming pressure to be uniformily applied, you can just divide total force (4*9.81 + 60 + 95*1000* 35*0.0001) by piston area (35*0.0001). you will answer in pascal.