Im licence eletrical contractor. Normally i charged cliemt base on total material cost plus labour cost plus transport charges and get some reasonable profit.not necesarry base on points. Because im the boss and im the worker too. As long as i got job got salary for my staff and retain some profit for tax. That emough for me.  So i agreed. It s depend to individual. Regardless of u r chiness malay or indian. U cant say others not good. Itd win win situation. U sabe budget we got business.