A shopkeeper promises to sell his goods at x% loss but he uses 20% less weight and gain 20%. Find x.

2% 5% 3% 4%

4%

Let actual weight = 1000 gm & CP of 1000 gm is Rs.1000 CP of 800 gm = Rs.800 20% = \(\frac{1}{5}\) ⇒ CP = 5P, SP = 6P So, CP = 800, then SP = 960 Now, Actual CP = 1000, SP = 960 Loss = 40 Loss % = \(\frac{40}{1000}\) × 100 = 4% = x% Hence, x = 4