A trader marks up his goods by 80% and gives discount of 25%. Besides it he weighs 10% less amount while selling his goods. What is the net profit of trader?

Consider actual price of 1 g goods = Re. 1.
He sells the product equals to Rs. 90 only (10% less weighing)
Again MP = Rs.1.8 and SP = 1.35 for 1 g.
Thus he gives the goods worth Rs. 90 and charges Rs. 135 after 25% discount.
Thus the profit % = [(135 - 90) / 90 ] x 100
= 50%