Does input signal mean same as input in transistors as amplifier?
JM97 - as you probably know, each transistor-based signal amplifier needs DC biasing. Hence, we always have to discriminate between (a) DC currents and voltages and (b) signal currents and voltages. That means: Varying currents/voltages around such a bias point (quiescent point) is considered to be a "signal".

Example: IC and VCE are DC values defining the operational DC point and corresponding changes (d(IC) and d(VCE), respectively) are signals. In many cases these deviations from the DC values are time varying in form of sinusoidal waves. 

As far as your task is concerned, I am sure that SIGNAL quantities (voltages and currents) are in question (even if they speak about "base current" only without saying explicitely "signal base current"). So, in principle, you have nothing to do than to apply Ohms law for relating voltages and currents and vice versa (the corresponding resistors are given).