Question regarding energy, BTU

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To maintain the same per capita energy expenditure with a 1% annual population increase in the U.S., an additional energy budget of approximately 9.7776 x 10^14 BTU is needed. The current population is 291 million, and the per capita energy expenditure is 58 barrels of oil, which is often interpreted as barrel of oil equivalents. The calculations provided were mostly correct but required fewer significant figures for clarity. Further assistance was requested to verify the calculations and ensure accuracy.
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"Assume that the population of the U.S. increases by 1%/yr. How many BTU of energy will have to be added to the national annual energy budget this year to maintain the same per capita expenditure?"

The current populations is listed as 291 million. And the current per capita energy expenditure = 58 barrels of oil.

I wasn't sure what to do. I guessed and ended up with 9.7776 X 10 to the 14, BTU increase. Can anyone help me out a bit?
 
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I think you assumed the questioner meant 58 barrel of oil equivalents and, in that case, you seem to have done it correctly, except you've used too many significant figures in your answer. Can you show your calculations?
 

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