Single subtraction

Hey All,

Code:

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MK=1.2949;

txtSL.Text = Convert.ToString(MK-0.0020);

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Why does this give me an answer of "1.29289994049072" and not "1.2929"?

MK is of type "Single".

TIA.

try:
MK=1.2949;

txtSL.Text = Convert.ToString(MK- (single)0.0020);

Thanks! ;)