A MERCHANT HAS 1000 KG OF SUGAR, PART OF WHICH HE SELLS AT 8% PROF...

17. A merchant has 1000 kg of sugar, part of which he sells at 8% profit and the rest at 18% profit. He gains 14% on the whole. The quantity (in kg.) sold at 18% profit is: (1) 560 (2) 600 (3) 400 (4) 640