anyone claiming 12.4 correct has lost their marbles dude.

no mater what comes after the 4 in 12.34 it's still going to be rounded to a 3.

the 4 part of 12.34 defines the 1st decimal number as beng closer to 3 than 4 (decimal number probably isn't the right term but you know what I mean the 1st number after the decimal point)

this is simple,
1.49 is very nearly 1.5 but it's not, it's <1.5 and therefore rounds to 1, try looking at everything after that first decimal as a whole not one by on from the right, that's madness.

same applys here. keep your collegues away from any important programming for all of our sakes!