0.0575
Why do you think 0.0585? Rounding can change only the last digit, not some digit in the middle.
And the simplest rule is - if the next digit is 5 or more (5,6,7,8,9) round up, if it is 4 or less (4,3,2,1,0) don't change. So
0.40 -> 0.4
0.41 -> 0.4
0.42 -> 0.4
0.43 -> 0.4
0.44 -> 0.4
0.45 -> 0.5
0.46 -> 0.5
0.47 -> 0.5
0.48 -> 0.5
0.49 -> 0.5
Any further digits are just ignored, so there is no difference between 0.411 and 0.419.
There are also some more elaborate systems, but they are rarely used and not worth your attention.