Correct Answer: Option E
The Rate of interest = (SI×100)/ Pn
= (30240 ×100)/84000×3 = 12%
C I = P ( 1+ r/100 )n –P
= 84000 ( 1 + 12/100)³ - 84000
= 84000 × 1.12 × 1.12 × 1.12 – 84000
= 118013.952 – 84000
= Tk.34013.95. Ans.
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