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The percentage of births in the U.S. delivered via C-section can be given by the following formula for the years since 1996.

$\displaystyle{p = 0.8(y-1996)+21}$

In this formula $y$ is a year after 1996 and $p$ is the percentage of births delivered via C-section for that year. What percentage of births in the U.S. were delivered via C-section in the year 2001?

of births in the U.S. were delivered via C-section in the year 2001.