A shopkeeper made a profit of P% on selling an article at a certain price. If the article is sold at 58.33% of the original selling price, the shopkeeper incurs a loss of 16%. Another article is sold at two successive discounts of P/2% and Q%, with a selling price of Rs. 1404 and a cost price of Rs. 1200. Find the value of Q% if the second article is marked up by 100%.