The balance of a trader weighs 8% less than it should. Still the trader marks up his goods to get an overall profit of 30%. What is the mark up on the cost price?
Pick one.
A) 40%
B) 19%
C) 25%
D) 16.66%
E) 9%
The most natural way to deal with 'weights' questions is by assuming values.   Say the trader's balance shows 100 gms. It is actually 92 gms because it weighs 8% less. Say, the cost price is $92 ($1/gm). Since he gets a profit of 30%, the selling price must be 92+(30/100)*90= 
<gadget id="calculator">92+(30/100)*90</gadget>
<output>119</output>
$119   Since the cost price is actually supposed to be $100 (for 100 gms) and the selling price is $119, the mark up is simply 19%   Ans : 19%.
<result>B</result>
The balance of a trader weighs 8% less than it should. Still the trader marks up his goods to get an overall profit of 30%. What is the mark up on the cost price?