A trader mixes 25 kg of rice at Rs. 20 per kg with 25 kg of rice of other variety at Rs. 30 per kg and sells the mixture at Rs. 30 per kg. His profit percent is: Choose one.
A) No profit, no loss  B) 5%  C) 8%  D) 20%  E) None of these
C.P. of 50 kg rice = Rs. (25 x 20 + 25 x 30) = Rs. (500 + 750) = Rs. 1250   S.P. of 50 kg rice = Rs. (50 x 30) = Rs. 1500   Gain =250/1250x100% = 20%.   Answer: Option 20%
<result>D</result>
A trader mixes 25 kg of rice at Rs. 20 per kg with 25 kg of rice of other variety at Rs. 30 per kg and sells the mixture at Rs. 30 per kg. His profit percent is: