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The simple interest on a sum of money will be rupees 210 after 3 years. In the next 3 years, principal become 4 times, then the total interest at the end of 6 years.
  • a)
    1020
  • b)
    1050
  • c)
    1080
  • d)
    1100
  • e)
    None of these
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The simple interest on a sum of money will be rupees 210 after 3 years...
Answer – b) 1050 Explanation : 210 = P*(r/100)*3 now, SI = 4*p*(r/100)*3 SI = 4*210 = 840. So total SI for 6 years = 840 + 210 = 1050.
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The simple interest on a sum of money will be rupees 210 after 3 years...
Given: Simple interest after 3 years = Rs. 210

To find: Total interest at the end of 6 years

Solution:

Let the principal be P and the rate of interest be R.

Simple interest for 3 years = P*R*3/100 = 210

So, PR = 210*100/3 = 7000

After 3 years, the principal becomes 4 times, i.e., it becomes 4P.

Simple interest for the next 3 years = 4P*R*3/100 = 12PR/100 = 12*7000/100 = 840

Total interest for 6 years = Simple interest for 3 years + Simple interest for the next 3 years

= 210 + 840

= 1050

Therefore, the total interest at the end of 6 years is Rs. 1050.

Answer: Option B
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The simple interest on a sum of money will be rupees 210 after 3 years. In the next 3 years, principal become 4 times, then the total interest at the end of 6 years.a)1020b)1050c)1080d)1100e)None of theseCorrect answer is option 'B'. Can you explain this answer?
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