To earn an extra profit, a shopkeeper mixes 30 kg of rice purchased at Rs. 36/kg and 26 kg of rice purchased at Rs. 20/kg. What will be the profit that he will make if he sells the mixture at Rs. 30/kg?
A) 8% B) 5% C) 3% D) 4% E) 6%

• C.P. of 56 kg rice = Rs. (26 x 20 + 30 x 36) = Rs. (520 + 1080) = Rs. 1600.
  
  S.P. of 56 kg rice = Rs. (56 x 30) = Rs. 1680.
  
  Gain = (80 / 1600 x 100) % = 5%.
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