That's a stupid question.
200 billion
There is insufficient information to provide a unique answer. There could have been 800 - 2*k hamburgers and 3*k hot dogs where k is any integer in the range [0, 400].
Over 300,000 Cutlass Supremes were sold in 1977.
When it first opened, the McDonald brothers sold their hamburgers for 15 cents each.
None.
Hmmmm... Hamburgers? And fries?
The first Apple computer was sold in 1977.
pot-it-notes was out in stores in the 1980's
A 1977 Cadillac Deville 2 door coupe sold new for $9,810.A 1977 Cadillac Seville 4 door sedan sold new for $13,359.
Anything special: we have dozens of MacDonalds restaurants and others, also freezed hamburgers are sold in supermarkets.
Assuming you are asking about sales : About 47 million burgers are sold at McDonald's branches worldwide.