A trader marks his goods 30% more than the cost price and gives his customers a discount of 20% on their bills. What percentage of profit does he make?

A trader marks his goods 30% more than the cost price and gives his customers a discount of 20% on their bills. What percentage of profit does he make?
एक व्यापारी अपने माल पर लागत मूल्य से 30% अधिक मूल्य अंकित करता है तथा अपने ग्राहकों को उनके बिलों पर 20% की छूट देता है। उसे कितने प्रतिशत लाभ होता हैं?