Correct Answer: Option C
Amount, A = P + S I for 2 ½ years = Tk.1012
Amount for 4 years = Tk.1067.20.
Therefore, S I for 1 ½ years = Tk.1067.20 – Tk.1012 = Tk.55.20
So, S I for 2 ½ years = 55.20 ÷ 3/2 × 5/2 = 55.20 × 2/3 × 5/2 = Tk.92.
Therefore, the Principal = Amount – S I = 1012 – 92 = Tk.920.
Rate of interest = S I × 100/P n
= 92 × 100/920 × 5/2
= 92 × 100 × 2 / 920 × 5
= 4%.
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