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

₹ 600
₹ 900
₹ 1200
₹ 1500

Correct Answer: ₹ 1200

Explanation:

Let the principle and rate of interest be P and R%
Then, (P x R x 10)/100 = 600
⇒ PR = 6000
Total interest at the end of year = 300 + (3P x R x 5)/100 = 300 + (15 x 6000)/100 = ₹ 1200

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