The cost price of 50 articles is the same as the selling price of 30 articles. Find gain/loss %.

gain 66\(\frac{2}{3}\)%   loss 66\(\frac{2}{3}\)% gain 60% loss 60%

gain 66\(\frac{2}{3}\)%

CP × 50 =  SP  × 30 gain % = \(\frac{2}{3}\) × 100% = \(\frac{200}{3}\) = 66\(\frac{2}{3}\)%