A trader mixes 26 kg of rice at $₹$20 per kg with 30 kg of rice of other variety at $₹$36 per kg and sells the mixture at $₹$30 per kg. His profit percent is:

Cost price of 56 kg rice$= 26 x 20 + 30 x 36$

$=520+1080$

$=₹1600$

Selling price of 56 kg rice$=56\times 30$

$=₹1680$

Required profit percentage$=\frac{(1680-1600)}{1600}\times 100$

$$\begin{gathered} =\frac{80}{1600}\times 100 \\ =5 \mathrm{\%} \end{gathered}$$