Correct Answer: Option C
Given, CI for 3 years = Tk.800
CI for 4 years = Tk.840
Therefore, CI for 3 rd year,
i.e. for the principal Tk.800 = 840 -800 = Tk.40
i.e. Tk.40 is the simple interest for Tk.800
then, the rate of interest = 40 × 100/800
= 5%.
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