I have a formula that is calculating the difference between two cells
containing other formulas. The final formula answer will contain trailling
digits even though neither of the original formulas had them.

For example:

The answer to formula one is 195,195.38 (J33)
The answer to formula two is 199,145.00 (J69)

The final formula is =(J33)-(J69) but the answer is (3,949.61999999987)

What causes the trailing digits, instead of only two after the decimal?
Each of the anwers to the first two formulas have only two digits after the
decimal?