On selling 36 mobiles, a mobile vendor got a loss equivalent to the selling price of four mobiles. The loss percent is:
Let's assume the selling price of one mobile is Rs. 1.
Selling price of 36 mobiles = 36$$\times$$Â Rs. 1
=Â Rs. 36
Loss on 36 mobiles = selling price of 4 mobiles = Rs. 4
Cost price of 36 mobiles =  Selling price of 36 mobiles + Loss on 36 mobiles
=Â Rs. 36 +Â Rs. 4
=Â Rs. 40
loss percent =Â $$\frac{loss}{\cos t\ price}\times100$$
=Â $$\frac{4}{40}\times100$$
= 10%
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