Profit percentage earned on selling article 'I' is the same as the percentage loss incurred on selling article 'J'. If the cost price of article 'I' is Rs. 900 and the cost price of article 'J' is Rs. 1100 and the average selling price of both articles is Rs. 950, then find the profit percentage earned on selling article 'I'.
ATQ, Let profit percentage earned on selling article 'I' = Loss percentage incurred on selling article 'J' = x% 
