An average car emits 4.7 million metric tons (MMt) of CO2 each year when it runs on gas. If corn ethanol from biomass is used instead of gas, the car emits 52% less CO2. How much CO2 would the same car emit in a year if it ran on corn ethanol made from biomass?

2.256

Explanation:

This is a percent change problem. The CO2 emitted by a car using gas is 4.7 MMt per year. The CO2 emitted by a car using corn ethanol made from biomass is 52% less than 4.7 MMt.

Find 52% of 4.7 MMt:

0.52 × 4.7 = 2.444.

Subtract 2.444 MMt from 4.7 MMt:

4.7 − 2.444 = 2.256.

The solution is 2.256 MMt.

Explanation:

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