Why is it wrong and what is the correct procedure to calculate the
percentage increase? Just curious!

Consider going from 30 to 33. It's an =increase= of 10% (an increase of
3, referenced to the starting point of 30). The =new= value is 110% of
the old value (100% + 10%). There are several equivalent ways of
calculating a percent increase, one is to divide the new value by the
old value, convert to percent ("per hundred"), and then subtract 100%.
In the AOPA case, 70.1/19.3 = 3.63 so the new value is 363% of the old
value. Since the old value is (by definition) 100%, when we subtract
that, we get a 263% increase.

I wouldn't blame Boyer; he's probably using an old pentium. "two plus
two is pretty close to three point something".

Jose
--
Humans are pack animals. Above all things, they have a deep need to
follow something, be it a leader, a creed, or a mob. Whosoever fully
understands this holds the world in his hands.
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