Direction : Study the following table and answer the questions that follow : Electricity consumption (in MWh) in three quarters (Q1, Q2 and Q3) by five industrial zones (U, W, X, Y and Z)Industrial Zone Electricity Consumption (in MWh) Total Q1 Q2 Q3 U 120 150 180 450 W 180 210 240 630 X 160 180 220 560 Y 240 240 300 780 Z 200 220 260 680 Total 900 1000 1200 3100
By what percentage did the electricity consumption of Zone U increase from Q1 to Q3 ?
50%
Percentage increase compares the rise in a value with its starting value: \(\text{Increase} \% = \frac{\text{New} - \text{Old}}{\text{Old}} \times 100\).
Step 1 — From the table, Zone U consumed 120 MWh in Q1 and 180 MWh in Q3.
Step 2 — Increase = \(180 - 120 = 60\) MWh.
Step 3 — Percentage increase = \(\frac{60}{120} \times 100 = 50\%\).
Dividing the increase by the Q3 value instead (\(\frac{60}{180} \times 100 \approx 33.3\%\)) is a common slip; the base must be the Q1 value. 60%, 70% and 40% do not match the computed rise.
50% option is correct.
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