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What is 30% of the sum of the first 200 natural numbers?

Answer and explanation

Correct answer: 6030

Use the governing formula Sₙ = n(n + 1)/2 for the sum of the first n natural numbers. For n = 200, S₂₀₀ = 200 × 201 / 2 = 100 × 201 = 20100. Convert 30% to the fraction 30/100 = 3/10. Therefore, 30% of the sum is (3/10) × 20100 = 6030. Hence option C is correct. A quick check is that 10% of 20100 is 2010, so three such portions equal 6030. Option A is too small and corresponds to an incorrect treatment of the sum, while B and D differ from the correct result by 15 and 15 respectively. The percentage must be applied after calculating the complete sum.

Related tags

Sum Of Natural NumbersPercentageSequencesArithmetic CalculationSum Of First N Natural NumbersSequences And ProgressionsMathematicsClass 9 Mcq

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