Round off to 3 decimals: return decRound(total, 3);
More examples are below:
decRound(1234.6574,2) returns the value 1234.66.
decRound(1234.6574,0) returns the value 1235.
decRound(1234.6574,-2) returns the value 1200.
decRound(12345.6789,1) returns the value 12345.70.
decRound(12345.6789,-1) returns the value 12350.00.