$\text{Current gain in common base is } \frac{\Delta I_C}{\Delta I_E} = 0.96}

$  \frac{\Delta I_C}{\Delta I_C + \Delta I_B} = 0.96 \Rightarrow \frac{1}{1 + \frac{\Delta I_C }{ \Delta I_B}} = 0.96$

$\text{ on Solving } \frac{\Delta I_C}{\Delta I_B}= 24$