Question

If a particular utility burned 5.40 million tons of coal that was 2.00% sulfur by weight, how many tons of sulfur dioxide was emitted?

Answer 1

For this case what you must do is the following rule of three:
5.40 million tons ----> 100%
x -------------------------> 2%
Clearing x we have:
x = (2/100) * (5400000)
x = 108000
Answer:
108000 tons of sulfur dioxide was emitted