Posted by Anonymous on Wednesday, March 28, 2012 at 12:02pm.
assuming x is the number of days,
h(x) is the number of hats sold on day x,
h=0 means no hats sold that day, because all were sold, so that is the last day.
h(x) = 0 when x = [-20 +/- sqrt(400+16)]/-.8
x = 50.5
so, some time during the 51st day sales went to zero.
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