The balance of a trader weighs 10% less than it should. Still the trader marks up his goods to get an overall profit of 40%. What is the mark up on the cost price?  Options:	A) 40%	B) 8%	C) 25%	D) 16.66%	E) 26%
The most natural way to deal with 'weights' questions is by assuming values.   Say the trader's balance shows 100 gms. It is actually 90 gms because it weighs 10% less. Say, the cost price is $90 ($1/gm). Since he gets a profit of 40%, the selling price must be 90+(40/100)*90= 
<gadget id="calculator">90+(40/100)*90</gadget>
<output>126</output>
$126   Since the cost price is actually supposed to be $100 (for 100 gms) and the selling price is $126, the mark up is simply 26%.   Ans : 26%
<result>E</result>
The balance of a trader weighs 10% less than it should. Still the trader marks up his goods to get an overall profit of 40%. What is the mark up on the cost price?