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A trader buys 100 pens at $2 each, sells 80 at $3 each, and 20 at $1.50. Profit?
Answer
$40
Explanation
Cost (=100×2=$200); revenue (=80×3+20×1.5=270); profit (=70). (Not $40.)
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Skills You Achive
Weighted sums
profit calc
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