The CEO of McDonald's Don Johnson earns $13.8 m per year. To calculate his earning per second, first convert this to a daily rate (using 365 days - a standard year).

`therefore 13800000/365=37808.21918` per day

There are 24 hours in a day:

`therefore 37808.21918/24=1575.342466` per hour

There are 60 minutes in an hour:

`therefore 1575.342466/60=26.25570776` per minute

and finally, there are 60 seconds in a minute:

`therefore 26.25570776/60=0.437595129` per second.

Rounding off the answer reveals that Don Johnson effectively earns 44 cents per second, working on a 7-day week. 

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Ans:

The CEO of McDonald's earns $0.44 or 44 cents every second (in a standard, non-leap, year) based on earnings indicated.