In order to increase the volume of a gas by `10%` , the pressure of the gas should be

Explanation

V' V + 10% of V = V + 1 V = 1.1V
`P' xx (1.1 V) = PV`
`P' = (P)/(1.1) = (10)/(11) P`
% change `= (1 - (10)/(11)) P = (1)/(11) P xx 100 = (100)/(11) = P`