When subtotaling can Excel also calculate percentages

[Guest]

When subtotaling a column based on a field change in another column can Excel
also calculate percentages for each value that makes up the sub total.

 

[Guest]

When subtotaling a column based on a field change in another column can Excel
also calculate percentages for each value that makes up the sub total.

What I realy need are the percentages

EXAMPLE
NAME1 100
NAME1 100
NAME1 100
NAME1 100
NAME2 300
NAME2 300

DESIRED RESULT
NAME1 100 .25
NAME1 100 .25
NAME1 100 .25
NAME1 100 .25
$400
NAME2 300 .5
NAME2 300 .5