1.

A man sells an article at 10% gain. Had be sold at for Rs.60/- more he could have gained 20% what is cost price of article

Answer»

Rs. 600



First selling price = 110 % -----> X RUPEES 
=sold at for Rs.60/- = 120 % -----> X + 60 Rupees 

-

----------------------------------------------

10 % --------> 60

100 % ------->Rs.600/-

OR 
Short cut method : 
---------------------------
Profit,Profit = - 
Ptofit,Loss = + 
Loss,Loss = - 
Loss,Profit = + 
---------------------------
OPPOSITE ==> + 
SAME ===> - 
----------------------------
Profit ==> 10 % 
profit ==> 20% 

-

----------------

10 % ---------> 60

100 % --------> Rs.600/-



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