Simple interest on Rs. 200 for 6 month at rate of 2 paise per rupees per month is :

Appeared in: AIIMS Delhi NO - 2018

Explanation

The rate of interest '2 paise per rupee per month' translates to 2% per month, as 1 rupee equals 100 paise.
The principal amount is Rs. 200, and the time period is 6 months.
Using the simple interest formula SI = (P x R x T) / 100, the calculation is (200 x 2 x 6) / 100.
This simplifies to 2400 / 100, which equals Rs. 24.

Option A: This value is significantly lower than the correct interest and likely results from a miscalculation, such as incorrectly converting the rate.
Option B: This value is also incorrect and does not correspond to a logical calculation based on the provided information.
Option C: This would be the correct interest if the time period were 5 months instead of 6 (i.e., Rs. 4 interest per month × 5 months = Rs. 20).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Calculation of Simple Interest as background academic context rather than a clinical decision trigger.
This question assesses basic quantitative aptitude, a skill required in many competitive examinations.
While not directly a clinical skill, numeracy is important for nurses for tasks like medication dosage calculation, fluid balance charting, and interpreting numerical data in patient reports.
What if the rate was '2 paise per rupee per year'? The monthly rate would be (2/12)% or approx 0.167%. The total interest for 6 months would be SI = (200 * (2/12) * 6) / 100 = Rs. 2. The answer would change significantly.

How to Approach the Question

First, carefully read the question to identify the Principal (P), Rate (R), and Time (T).
Pay close attention to the units of the rate. Here, '2 paise per rupee per month' needs to be converted to a standard percentage.
Recognize that '2 paise per rupee' is equivalent to 2 out of 100, which is 2%.
Ensure the time unit for the rate (monthly) matches the given time period (months). If not, convert one of them.
Apply the simple interest formula: SI = (P × R × T) / 100.
Perform the calculation and compare the result with the given options to find the correct answer.

Concept Tested & Keywords

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Practise the full AIIMS Delhi NO - 2018

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