A merchant mixes 50 kg of rice costing ₹60/kg with another variety costing ₹90/kg. He sells at ₹75/kg with 8% profit. How much of the second variety(approximate) did he mix?

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**Steps:**
1. Let $x$ kg be the second variety.
2. Total cost: $C=50	imes60 + x	imes90 = 3000+90x$.
3. Revenue: $R=(50+x)	imes75$. With 8% profit, $R=1.08C$. So $75(50+x)=1.08(3000+90x)$.
4. Solve: $3750+75x=3240+97.2x\Rightarrow510=22.2x\Rightarrow x\approx23$ kg.

FINAL_ANSWER: c

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