$A$ person has $60$ pens. He sells some of these at a profit of $12 \%$ and the rest at $8 \%$ loss. On the whole,he gets a profit of $11 \%$. How many pens were sold at $12 \%$ profit and how many at $8 \%$ loss?
- A$57$ pens at $12 \%$ profit and $3$ pens at $8 \%$ loss
- B$58$ pens at $12 \%$ profit and $2$ pens at $8 \%$ loss
- C$55$ pens at $12 \%$ profit and $5$ pens at $8 \%$ loss
- D$50$ pens at $12 \%$ profit and $10$ pens at $8 \%$ loss
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