By selling 80 oranges, a vendor loses the cost price of 20 oranges. His loss% is?

20% 24% 25% 26%

25%

Loss = CP - SP CP = cost price of 1 orange  Sp = selling price of 1 orange Loss = CP of 20 oranges 80CP - 80SP = 20CP 60CP = 80SP CP  : SP   4  : 3 Loss % = \(\frac{1}{4}\) x 100 = 25%