The cost price of 30 articles is the same as the selling price of x articles. If the profit is 25%, what is x?
Options:
A) 18
B) 20
C) 22
D) 24
E) 26

Rationale: let the cost price = y the cost price of 30 articles = 30 y the selling price of x articles = 1.25 y * x 1.25 y * x = 30 y x = 30 / 1.25 = 24 the answer is d .
Answer: D