A trader mixes $26$ kg of rice at Rs. $20$ per kg with $30$ kg of rice of other variety at Rs. $36$ per kg and sells the mixture at Rs. $30$ per kg. What is his profit percent?

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Solution

C.P. of $56$ kg rice $=$ Rs. $(26 \times 20 + 30 \times 36) =$ Rs. $(520 + 1080) =$ Rs. $1600$ .
S.P. of $56$ kg rice $=$ Rs. $(56 \times 30) =$ Rs. $1680$
Gain $= \frac{1680 - 1600}{1600} \times 100 = \frac{80}{1600} \times 100 = 5 %$

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