Correct Answer: Option B
When the difference between CI and SI, rate of interest pa for 3 years is given,
Then the Sum can be calculated as:
Sum = Difference × 100³/r² (300 + r)
= 3840 × 100³/ 20² ( 300 + 20)
= 3840 × 100 × 100 × 100/400 × 320
= Tk.30000.
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