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- Identify the given values: principal, rate, time, interest, or amount.
- Apply the correct simple interest formula.
- Match the obtained answer with the options.
Correct Answer: D
Correct Answer: D
Method / Topic: Simple Interest
The answer follows the simple interest relation among principal, rate, time, interest, and amount.
Short Explanation
Detailed Explanation
Correct Answer: D
Method / Topic: Simple Interest
<table cellspacing="0" style="border-collapse:collapse; height:20px; width:85px">
<tbody>
<tr>
<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:top; white-space:normal; width:85px"><span style="color:#000000">Doubling means the simple interest equals the principal. Using SI=P×R×T/100 gives R=100/12.5=8 percent.</span></td>
</tr>
</tbody>
</table>
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Learn + Solve: Shortcut, Trap & Fast Route Click to view shortcut, steps, and common mistake
Shortcut used, common trap, and the fastest solving route
- Identify the given values: principal, rate, time, interest, or amount.
- Apply the correct simple interest formula.
- Match the obtained answer with the options.
At simple interest, a sum doubles itself in 12.5 years. What is the annual rate?
Explanation
Correct Answer: D
Method / Topic: Simple Interest
The answer follows the simple interest relation among principal, rate, time, interest, and amount.
Short Explanation
Detailed Explanation
Correct Answer: D
Method / Topic: Simple Interest
<table cellspacing="0" style="border-collapse:collapse; height:20px; width:85px">
<tbody>
<tr>
<td style="border-bottom:none; border-left:none; border-right:none; border-top:none; height:20px; vertical-align:top; white-space:normal; width:85px"><span style="color:#000000">Doubling means the simple interest equals the principal. Using SI=P×R×T/100 gives R=100/12.5=8 percent.</span></td>
</tr>
</tbody>
</table>
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