How much will be 25% of Rs 10?

Appeared in: BSF Staff Nurse - 2015

Explanation

The term 'percent' (%) means 'out of 100'. Therefore, 25% can be written as the fraction 25/100.
To find the percentage of a number, you convert the percentage to a decimal or fraction and multiply it by the number.
Converting 25% to a decimal gives 0.25 (since 25 ÷ 100 = 0.25).
Multiplying this decimal by the total amount gives the answer: 0.25 × Rs. 10 = Rs. 2.50.

Option B: This is an incorrect calculation. It may arise from mistakenly using 0.28 instead of 0.25 as the decimal equivalent of 25%.
Option C: This is an incorrect calculation. There is no straightforward mathematical error that leads to this result when calculating 25% of 10.
Option D: This is an incorrect calculation. It may arise from mistakenly using 0.29 instead of 0.25 as the decimal equivalent of 25%.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Calculating a percentage of a given number as background academic context rather than a clinical decision trigger.
Accurate calculation skills are fundamental in nursing for tasks like medication dosage calculation, IV drip rate regulation, and interpreting lab results expressed as percentages.
For example, if a solution has a 25% concentration of a drug, a nurse must be able to calculate the exact volume needed to administer a specific dose.
What if? - If a nurse needed to calculate 10% of a 25 mg tablet to get a required dose, the method would be the same: (10/100) × 25 = 0.10 × 25 = 2.5 mg. The principle remains constant regardless of the context.

How to Approach the Question

Identify the core task: The question asks to find a specific percentage (25%) of a given number (10).
Recall the definition of 'percent': It means 'per hundred'. So, 25% is equivalent to 25 out of 100.
Convert the percentage to a more usable form, either a fraction (25/100) or a decimal (0.25). Using decimals is often simpler for calculations.
Set up the multiplication: Multiply the decimal form of the percentage by the total number. In this case, the operation is 0.25 × 10.
Calculate the final result: 0.25 multiplied by 10 equals 2.5. Remember to include the correct unit (Rs.), making the answer Rs. 2.50.
Compare your result with the given options to select the correct one.

Concept Tested & Keywords

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