Correct Answer: Option D
At 5% more rate, the increase in SI for 10 years = Tk.600 (given)
So, at 5% more rate, the increase in SI for 1 year = 600/10 = Tk.60/-
Tk.60 is 5% of the invested sum
So, 1% of the invested sum = 60/5
Therefore, the invested sum = 60 × 100/5
= Tk.1200.
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