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2014-10-04T19:31:47+05:30

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Selling price = x
loss = 10%
Let the cost price = y

 \frac{y-x}{y} =  \frac{10}{100}

 \frac{y-x}{y} = 0.1

 y-x = 0.1y 
 y-0.1y = x 
 x = 0.9y 

If he had taken Rs. 70 more,
selling price would be = x+70
gain =4%

 \frac{(x+70)-y}{y} =  \frac{4}{100}
 x+70-y = 0.04y 
 0.9y + 70 - y = 0.04y
 0.9y -y -0.04y = -70
⇒ [tex ]-0.14y = -70 [ /tex]
 y = (-70)/(-0.14)
y = 500 <<<<<cost price
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