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A trader mixes 20 kg of rice at Rs.15 per kg with 25 kg of rice at Rs.20 per kg and sells the mixture at Rs.24 per kg. Then find his profit/loss percent.
Cost Price of 45 kg of rice $$= 20\times15+25\times20 = 300+500 = Rs.800$$
Selling Price of 45 kg of rice $$= 45\times24 = Rs.1080$$
Profit = 1080-800 = Rs.280
Profit percentage = $$\dfrac{280}{800}\times100 = 35$$
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