You need to create an osv.osv_memory class with the structure

class my_calculation(osv.osv_memory):
_columns={
'name':fields.char('Name',),
'percentage':fields.integer('Percentage',),
}

you have to display it the same way the 'Change Password' view is shown.

Pls refer to the class 'change_password_wizard' in addons\base\res\wizard

The same data could be shown using a Qweb template, if you see them as a report data.