The actual value of resistance R, shown in the figure is 30 $\Omega$.. This is measured in an experiment as shown using the standard formula $\mathrm{R}=\frac{\mathrm{V}}{\mathrm{I}}$,where V and I are the readings of the voltmeter and ammeter, respectively. If the measured value of R is 5% less, then the internal resistance of the voltmeter is: