Answer
$83$ million
Work Step by Step
Midway through the year 2008 is $t=3.5$ years after the start of 2005.
$M(3.5)=0.8(3.5)^{4}-6(3.5)^{2}+10(3.5)+1$
$=82.55$ million,
Rounded to the nearest million:
$83$ million
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