For 4 adult patients per hour, Dr. Lindsay receives 4*50=<<4*50=200>>200 dollars per hour.
For the 3 child patients per hour, Dr. Lindsay receives 3*25=<<3*25=75>>75 dollars per hour.
Thus, Dr. Lindsay receives 200+75=<<200+75=275>>275 dollars per hour.
In an 8-hour day, Dr. Lindsay receives 8*275=<<8*275=2200>>2200 dollars.
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