Total bought were 12, then 1/4x + 1/6x. Equal number of each type of orange, so 6 of each, then:
1/4*6 + 1/6*6 = 3/2 + 1 = 5/2= 2.5. The shopkeeper invested 2.5 dollar.
If the shopkeeper sold the dozen per 3 dollar so he had a profit of 0.5 dolar, then 0.5/2.5 equals 1/5 or 0.2 or 20%.
Option D.
P.s.: But I got wrong in my first attempt.
1/4*6 + 1/6*6 = 3/2 + 1 = 5/2= 2.5. The shopkeeper invested 2.5 dollar.
If the shopkeeper sold the dozen per 3 dollar so he had a profit of 0.5 dolar, then 0.5/2.5 equals 1/5 or 0.2 or 20%.
Option D.
P.s.: But I got wrong in my first attempt.
