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→Cents
which can be rewritten as follows so you can plug it into a calculator...
n = 1,200 * log (b/a) / log (2)
To get the pitch of a note given an initial note pitch and the cent difference:
b = a * 2^(n/1200)
[http://hyperphysics.phy-astr.gsu.edu/hbase/music/cents.html GSU provides a handy webpage] to calculate cents based on two pitches.