A shopkeeper buys three types of pens. The first type costs him 6 pens for ₹35, the second 4 pens for ₹24, and the third 12 pens for ₹75. He mixes them in the ratio 4:3:5. If he sells all the pens at 5 for ₹32, what is his approximate gain or loss percentage?

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1. Find cost per pen of each type:
   - First: $35/6\approx5.8333$.
   - Second: $24/4=6$.
   - Third: $75/12=6.25$.

2. Mix in ratio 4:3:5 (take 4,3,5 pens). Total cost = $4	imes(35/6)+3	imes(24/4)+5	imes(75/12)=72.5833$. Cost per pen = $72.5833/12\approx6.0486$.

3. Selling price per pen = $32/5=6.4$. Profit percent = $\dfrac{6.4-6.0486}{6.0486}	imes100\approx5.81\%$. So approx **profit 5.8%**.

FINAL_ANSWER: b

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