Table: Monthly electricity use of an office, in kWh — January 1,200; February 1,000; March 1,500; April 1,800. By what percentage did use increase from March to April?

Correct answer: B. 20%

Increase = 1,800 − 1,500 = 300 kWh. Percentage increase = 300 ÷ 1,500 × 100 = 20%, based on the earlier month, March. Dividing by April, the later month, would wrongly give about 16.7%.

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Answer and explanation

The correct answer is B. 20%

Increase = 1,800 − 1,500 = 300 kWh. Percentage increase = 300 ÷ 1,500 × 100 = 20%, based on the earlier month, March. Dividing by April, the later month, would wrongly give about 16.7%.

Topic: Data Interpretation Practice MCQs · Subject: Analytical Ability