Which fuel had the largest relative increase in use between 2015 and 2020?
A town reports the fuel used (in gigawatt-hours) by its district heating plant in two years. The table lists each fuel.
Fuel | 2015 | 2020
Biomass | 120 | 150
Waste heat | 40 | 70
Oil | 60 | 20
Electricity | 30 | 40
Fuel | 2015 | 2020
Biomass | 120 | 150
Waste heat | 40 | 70
Oil | 60 | 20
Electricity | 30 | 40
Answer and explanation
Correct answer: A. Waste heat
- Step 1: Relative increase change divided by the 2015 value: biomass , waste heat , electricity . Step 2. Waste heat has the largest value, 75%. Answer: Waste heat. Why not the others: Biomass rose by the same 30 as waste heat, but from a larger base, so its relative rise is smaller; oil fell, so it did not rise.
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