reportit interface utilization percent have a problem,help!

[yardian]

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and my reportit's config is :
maxv BW Bits/s AVERAGE √ √ maxValue
Maximum Traffic in Bits/s MAX Bits/s AVERAGE √ f_max*8
Max utilization percent MUTR % AVERAGE √ MAX/BW*100
BW's Prefixes is 1000,MAX's prefixs is 1024,MUTR's prefixs is off.graph Templates's prefixs is 1024.
how to make MUTR is correct?thanks a lot!