How many kilograms of sugar costing Rs. 9 per kg must be mixed with 27 kg of sugar costing Rs. 7 per kg so that there may be a gain of 10 % by selling the mixture at Rs. 9.24 per kg?
Choose the correct option: A) 60 B) 50 C) 55 D) 63 E) 70
Selling price of 1kg = 924   profit = 10%   cost = 100/(100+profit%)*SP     100/(100+10)*9.24= 
<gadget id="calculator">  100/(100+10)*9.24</gadget>
<output>8.4</output>
8.4   Mean price= (8.4-7=1.4) (9-8.4=0.6)   =&gt;1.4:0.6=14:6 = 7:3   3x=27*7=63   ANSWER 63
<result>D</result>
How many kilograms of sugar costing Rs. 9 per kg must be mixed with 27 kg of sugar costing Rs. 7 per kg so that there may be a gain of 10 % by selling the mixture at Rs. 9.24 per kg?