Discussion
The simple interest on a sum of money will be Rs.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?
Answer: C
Rs. 600 over ten years means Rs. 60 a year on the original principal.
First five years at the original principal:
\[ 5 \times 60 = \text{Rs. } 300 \]
Next five years with the principal trebled, so three times the yearly interest:
\[ 5 \times 180 = \text{Rs. } 900 \]
\[ \text{total} = 300 + 900 = \text{Rs. } 1200 \]
Trebling the whole Rs. 600 would give Rs. 1800; only the second half of the period is affected.
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