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

Correct answer: B. about 17%

Decrease = 200 kWh. Percentage decrease = 200 ÷ 1,200 × 100 ≈ 16.7%, or about 17%. Using February as the base would wrongly give 20%.

hard

Answer and explanation

The correct answer is B. about 17%

Decrease = 200 kWh. Percentage decrease = 200 ÷ 1,200 × 100 ≈ 16.7%, or about 17%. Using February as the base would wrongly give 20%.