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The rate of a country's sales of bottled water for the period

`2007-2014`

could be approximated by

`s(t)=0.02t^(2)-0.28t+8.4 billion gallons per year (0<=t<=7),`

where

`t`

is time in years since the start of 2007. Use a Riemann sum with

`n=5`

to estimate the total sales of bottled water in this country from the start of 2008 to the start of 2014 . (Round your answer to the nearest billion gallons. Use a left Riemann sum to find your answer. Round your answer to the nearest whole number.) HINT [See Example 2.] billion gallons