The cost price of a camera is 90% of its selling price. The profit percentage is:
The cost price of a camera is 90% of its selling price.
cost price = 90% of selling price
$$cost\ price=\frac{90}{100}\times\ selling\ price$$
cost price :Â selling price = 9 : 10
So let's assume cost price = 9y and selling price = 10y.
Profit percentage =Â $$\frac{\left(10y-9y\right)}{9y}\times\ 100$$
=Â $$\frac{y}{9y}\times\ 100$$
=Â $$11\frac{1}{9}$$ %
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