A trader sells one variety of sugar at ₹36 per kg, incurring a 10% loss, and another variety at ₹48 per kg, incurring a 20% loss. If he mixes the two varieties in equal quantities and sells the mixture at ₹42 per kg, what is his overall profit or loss percentage?

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1. Find cost prices: $CP_1=36/0.9=40$ and $CP_2=48/0.8=60$. 
2. Mix equal quantities so average cost $CP_{mix}=(40+60)/2=50$. 
3. Selling price is ₹42, loss per kg = $50-42=8$ so loss% = $8/50=0.16$ i.e. 16%. 
4. So overall **loss of 16%**.
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