Changing fifths to tenths

Hi. I'm new here and new to C++. I'm writing a program which analyzes a race horses pace performance. The data I get is formatted thus: i.e.
second call time = 44.2 seconds. The number to the right of the decimal point is not in tenths of a second, but in fifths. The corrected number would read:
44.4 seconds. Is there any way for C++ to convert this number from fifths to tenths.
i.e. 42.4 = 42.8
43.3 = 43.6
and so on...
Cross posting is frowned upon. See my reply in the General C++ forum.
Sorry jR. I figured it's a basic newbie question, but perhaps someone with more experience
would be needed. I'll remember your advice in the future though.
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