Correct Answer: Option B
C.P. of 1st transistor = Tk. (100/120)x 840 = Tk. 700.
C.P. of 2nd transistor = Tk. (100/96) x 960 = Tk. 1000.
So, total C.P. = Tk. (700 + 1000) = Tk. 1700.
Total S.P. = Tk. (840 + 960) = Tk. 1800.
So, Gain % ={(100/1700) x 100}%
= 5(15/17)%
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