Does anyone know how to figure out this chemistry problem?

It has been said that every breath we take, on average, contains molecules that were once exhaled by Wolfgang Amadeus Mozart (1756-1791). If there are 1.09 x 10^44 air molecules in the atmosphere, and in this 35 year life span Mozart exhaled 2.61 x 10^30 molecules of air, calculate the fraction of molecules in the atmosphere that were exhaled by Mozart.

Please explain how you got the problem.
Thank you for all your help.
 
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