1.  By selling 12 toffees for a rupee, a man loses 20%. How many for a rupee should be sell to get a gain of 20%?
A. 5
B. 8
C. 10
D. 15

Answer: Option B

Explanation:

Let S.P. of 12 toffees be ₹ X.

Then,

⇒ 80 : 1 = 120 : X or X = 120/180 = 3/2

For ₹ 3/2, toffees sold = 12.

For Re. 1, toffees sold = 12 x 2/3 = 8