The simple interest on a sum of money will be Tk. 600 after 10 years. If the principal is trebled after 5 years, what will be the total interest at the end of the tenth year?

The simple interest on a sum of money will be Tk. 600 after 10 years. If the principal is trebled after 5 years, what will be the total interest at the end of the tenth year? Correct Answer Tk. 1200

We know the interest is directly proportional to time and principal. If the total interest for 100 years is Tk. 600, then it is Tk. 300 for the first 5 years. Now, the principal trabled after 5 years. So we get 3 times more interest for the next 5 year's. So instead of Tk. 300 we get Tk.900 So total interest = 300 + 900 = Tk. 1200
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