[QW][4348234] Sale Price based on cost and margin

# Task : https://www.odoo.com/odoo/project.task/project.task/4348234
# Need : sales price computed based on the cost and margin
# Pastebin : https://pastebin.com/gQGgZvxM
record['x_studio_margin'] = 1- (record.standard_price /record.x_studio_list_price_excluded)