Question:medium

Alex invested his savings in two parts. The simple interest earned on the first part at 15% per annum for 4 years is the same as the simple interest earned on the second part at 12% per annum for 3 years. Then, the percentage of his savings invested in the first part is

Updated On: Jan 15, 2026
  • 62.50%

  • 37.50%

  • 60%

  • 40%

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The Correct Option is B

Solution and Explanation

The correct answer is B: 37.50%. Alex allocated his savings into two investments. The first investment earned 15% annual interest over 4 years, and the second earned 12% annual interest over 3 years. Let ₹x be the amount invested in the first part and ₹y be the amount invested in the second part. The interest from the first part is \(0.15\times{x}\times4\), and the interest from the second part is \(0.12\times{y}\times3\). Setting these interests equal: \(0.15\times{x}\times4=0.12\times{y}\times3\). Simplifying this equation yields \(0.6x = 0.36y\), which further reduces to \(20x=12y\). The ratio of x to y is therefore 3:5. The percentage of savings invested in the first part is calculated as \(\frac{3}{(3+5)}=\frac{3}{8}=0.375\). Converting this to a percentage, we get 37.5%. Alex invested 37.5% of his savings in the first part.
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