How to find RAF and RGF when excess air is 20%

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darkmagic
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Homework Statement



given the ultimate analysis of the fuel

c - 88.3%
h - 9.5%
o -
n -
s - 1.4%
ash - 0.8%

find the:

a. raf and rgf
b. concentration of so2 and particulate matter if excess air is 20%.

i know how to calculate the raf and rgf, i also know how to compute the so2 and particulate
matter but i don't know to compute them if excess air is given.

what should i do to the excess air = 20%?
 
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who knows what should i do?