Group By with condition

Hi, my problem is that i want to group Cars under when Total = 50
This is my XML:
<ROW>
<Car>BMW</Car>
<Total>100</Total>
</ROW>
<ROW>
<ROW>
<Car>Audi</Car>
<Total>90</Total>
</ROW>
<ROW>
<Car>Porche</Car>
<Total>40</Total>
</ROW>
<ROW>
<Car>Toyota</Car>
<Total>10</Total>
</ROW>
<ROW>
<Car>Daewo</Car>
<Total>48</Total>
</ROW>
I want to show this:
BMW - 100
Audi - 90
Others - 98
I tried this:
<?for-each-group:ROW;./Nacio?>
<?Car?>
<?xdoxslt:ifelse(.//Total>50, Car,'Others')?>
<?Total?>
<?end for-each-group?>
BUT this show bad:
BMW - 100
Audi - 90
Others - 48
Others - 40
Others - 10
Do you understand me?
thanks

many ways to do :)
let me give you idea
Simple, if you know the names fixed to 3 types.
option1:
BMW = <?sum(/ROOT/ROW[./Car=’BMW’]/Total)?>
Audi = <?sum(/ROOT/ROW[./Car=’Audi’]/Total)?>
Others = <?sum(/ROOT/ROW[(./Car!=’BMW’) and (./Car!=’Audi’)]/Total)?>option2:
<?for-each-group:/ROOT/ROW; xdoxslt:ifelse((./Car!=’BMW’) and (./Car!=’Audi’),’Others’,./Car)?>
<?current-grouping-key()?> = <?sum(current-group()/Total)?>
<?end for-each?>

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