[Rs. 1200] The simple interest on a sum of money will be Rs. 600 after 10 years. If the principle is trebled af

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

Rs.1100

Rs. 500

Rs. 1200

Rs. 900

Explanation:

We know that interest is directly proportional to time and principal.
If the total interest for 10 years is Rs.600, It is Rs.300 for the first 5 years.
Now the principal trebled after 5 years.
So we get 3 times more interest for the next 5 years.
So instead of Rs.300 we get Rs.900. So total interest = Rs.300 + Rs.900 = Rs.1200

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