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CP of 900 articles = 900 ×40/100 = Rs 360 SP of 500 articles = 360 + 360 ×50/100 = Rs 540 SP of 1 article = 540/500 = 27/25 SP of 650 articles = 27/25× 650 = Rs 702 Profit = 702 – 360 = Rs 342 Profit % = 342/360× 100 = 95%
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