Select the correct alternative from the given choices.
What quantity of first quality sugar costing 11 per kg should be mixed with 30 kgs of second quality sugar and 30 kgs of third quality sugar, costing 18 and 37 per kg respectively, such that a profit of 10% can be earned on selling the mixture at 11 per kg?
(1) 120 kg (2) 180 kg (3) 150 kg (4) 90 kg
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