I am really struggling with this and could use your help! Table 1.1 in your text

Question

I am really struggling with this and could use your help!

Table 1.1 in your text shows US energy consumption in QBtu from various sources
back in 2003. (One QBtu is 1.E15 Btu's, lots of energy!) It also shows that coal
provided 23.0 percent of our total energy that year. Let's assume that coal still
provides that same percentage of our total energy today, but that our energy demand
has increased by 13 percent since 2003. (Not unreasonable!) Now for
the
twist: SUPPOSE that we suddenly decided, for political reasons, to convert to a purely
coal-based society. So we need to satisfy our entire energy demand with coal only.
In this scenario, how many tons of coal would we need to burn per year? (Do NOT
enter units here, just the number of tons. So e.g. if your answer is two million tons, you could enter 2.0E6, which means 2 times ten to the 6 power)
Here's the link to the Table 1.1, which is on page 16.
http://media.wiley.com/product_data/excerpt/78/EHEP0006/EHEP000678.pdf
Thanks!

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