A shopkeeper gives a discount of 28% on the marked price of article P and selling price of article Q is \(33\frac{1}{3}\;\)% more than the selling price at article P, if shopkeeper made 20% profit on article Q and selling price of article P was Rs 200 less than the cost price of article Q, then find the cost price of article P, which shopkeeper sold at a profit of 20%?