The cost price of two types of tea are Rs. 180 per kg and Rs. 200 per kg respectively. On mixing them in the ratio 5:3, the mixture is sold at Rs. 210 per kg . In the whole transaction, the gain percent is Choose the correct choice from the following choices:	A) 10%	B) 11%	C) 12%	D) 13%	E) 14%
Exp. Let 5kg of first kind of tea be mixed with 3 kg of second kind   C.P of 8 kg of tea = Rs. ( 180*5 + 200*3 ) = Rs. 1500   S.P of 8 kg of tea = Rs. (210 * 8) = Rs. 1680   Gain = Rs. ( 1680 – 1500 ) = Rs. 180   Gain% = ( 180/1500*100 )= 
<gadget id="calculator">( 180/1500*100 )</gadget>
<output>12</output>
12%   ANSWER:12%
<result>C</result>
The cost price of two types of tea are Rs. 180 per kg and Rs. 200 per kg respectively. On mixing them in the ratio 5:3, the mixture is sold at Rs. 210 per kg . In the whole transaction, the gain percent is