1.  The cost price of 20 articles is the same as the selling price of x articles. If the profit is 25%, then the value of x is:
A. 15
B. 16
C. 18
D. 25

Answer: Option B

Explanation:

Let C.P. of each article be Re. 1 C.P. of x articles = ₹ x.

S.P. of x articles = ₹ 20.

Profit = ₹ (20 - x).

20 - x x 100 = 25
x

2000 - 100x = 25x

125x = 2000

x = 16.