The tyre of a motor car contains air at $15^{\circ}C$. If the temperature increases to $35^{\circ}C$ the approximate percentage increase in pressure is (ignore to expansion of tyre):

Question

\[\begin {array} {1 1} (a)\;7 & \quad (b)\;9 \\ (c)\;11 & \quad (d)\;13 \end {array}\]