A change of 10 mA in the emitter current produces a change of 7.5 mA in collector current in a transistor . What should be change in base current to produce the same change in collector current.

Question

$(a)\;0.25 \;mA \\ (b)\;3.5 \;mA \\ (c)\;1.5 \;mA \\ (d)\; 2.5 \;mA $