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google search
Google search results:
1: https://www.quora.com/A-shopkeeper-sold-two-watches-each-100-and-had-10-profit-on-one-and-10-loss-on-another-What-was-his-common-loss-or-gain-percent
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2: https://www.toppr.com/ask/en-us/question/a-person-sold-two-almirahs-for-rs-1980-each-on-one-he-gained-10-while/
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3: https://www.examveda.com/a-man-sells-two-articles-at-rs-99-each-he-gains-10-percent-on-one-and-loses-10-percent-on-the-other-then-on-overall-basis-he-92454/
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4: https://www.toppr.com/guides/quantitative-aptitude/profit-and-loss/percentage-loss/
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5: https://brainly.in/question/5554525
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6: https://studymild.com/aptitude/Profit-and-Loss/253003
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7: https://www.doubtnut.com/question-answer/two-watches-were-sold-at-the-same-price-one-was-sold-at-10-profit-and-the-other-was-sold-at-10-loss--7461915
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8: https://pos.toasttab.com/resources/how-to-increase-restaurant-sales
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9: https://podcasts.google.com/feed/aHR0cHM6Ly93d3cuYnVzaW5lc3Mtc3RhbmRhcmQuY29tL3Jzcy9wb2RjYXN0LnJzcw
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10: https://podcastaddict.com/podcast/2360740
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