By selling 12 toffees for a dollar, a man loses 20%. How many for a should dollar be sell to get a gain of 20%?
Choices:
A) 23
B) 12
C) 78
D) 2
E) 8
E   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 * 2/3= 
<gadget id="calculator">12 * 2/3</gadget>
<output>8</output>
8
<result>E</result>
By selling 12 toffees for a dollar, a man loses 20%. How many for a should dollar be sell to get a gain of 20%?