Correct Answer: Option B
S.I. on Tk. 1600 = T.D. on Tk. 1680.
So, Tk. 1600 is the P.W. of Tk. 1680,
i.e., Tk. 80 is on Tk. 1600 at 15%.
So, Time = (100 x 80)/( 1600 x 15) year
= 1/3 year
= 4 months.
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