What is the rate of simple interest for the first 4 years if the sum of ₹ 360 becomes ₹ 540 in 9 years and the rate of interest for the last 5 years is 6%?

What is the rate of simple interest for the first 4 years if the sum of ₹ 360 becomes ₹ 540 in 9 years and the rate of interest for the last 5 years is 6%?

• A. 4%
• B. 5%
• C. 3%
• D. 6%

 

The correct answer is option B. 5%. Can you explain this answer in the comments?

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