The current gain for a transistor working as common-base

The current gain for a transistor working as common-base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is

Current gain (α) = 0.96
I_e = 7.2 mA

	I_c	= α = 0.96
	I_e

I_c = 0.96 × 7.2 mA = 6.91 mA
I_e = I_c + I_b
⇒ I_b = I_e – I_c = 7.2 – 6.91 = 0.29 mA