Convert String

my data return string (always 9 character) as following,
000005330
000004110
000041660
how my GridView display above value into decimal. the expected result as following,
53.30
41.10
416.60
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Sample solution
  string a = "000005330";

            a = a.Insert(a.Length - 2, ".");

            float num = float.Parse(a);