Figure shows an arrangement to measure the emf $ϵ$ and internal resistance r of a battery. The voltmeter has a very high resistance and the ammeter has a very small resistance. The voltmeter reads 1.52 V when the switch S is open. When the switch is closed the voltmeter reading drops to 1.45 V and the ammeter reads 1.0 A. The internal resistance of the battery in  $x\times {10}^{-2}\Omega$ . The value of  $x$  is ________?