can you please help me explain how to solve this problem?

"In 2012, total U.S. bottled water consumption increased to 9.67 billion gallons, up from 9.1 billion gallons in 2011. In fact, 2012's consumption growth was the strongest it has been in five years. In addition, per-capita consumption is up 5.3 percent in 2012, with every person in America drinking an average of 30.8 gallons of bottled water last year. Bottled water increased in absolute volume more than any other beverage category in the U.S. Bottled water sales increased by 6.7 percent in 2012, and now total $11.8 billion."

(i) Estimate the per capita consumption from 2011 from data in the statement.

(ii) If bottled water sales are up by 6.7% in 2012 to a total of $11.8 billion, what were the sales in 2011?

(iii) Quantify the bottled water consumption increase from 2011 to 2012 in terms of absolute change.