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google search
Google search results:
1: https://www.quora.com/A-20-reduction-in-the-unit-cost-of-an-article-enables-one-to-buy-25-items-more-for-Rs-1-000-What-is-the-original-units-cost-of-the-item-12-8-10-or-15
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2: https://www.toppr.com/ask/en-us/question/a-20-reduction-in-the-unit-cost-of-an-article-enables-one-to-buy-25/
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3: https://brainly.in/question/7741567
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4: https://www.doubtnut.com/questions-answers/a-20-reduction-in-the-unit-cost-of-an-article-enables-one-to-buy-25-items-more-for-rs-1000-1755007
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5: https://files.eric.ed.gov/fulltext/ED199049.pdf
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6: https://www.iowa-city.org/WebLink/DocView.aspx?id=1550686&dbid=0&repo=CityofIowaCity
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7: https://www.engageny.org/file/40051/download/math-g6-m1-topic-c-lesson-20-teacher.pdf?token=GO3FeUvo
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8: https://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=910218Y3.TXT
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9: https://lfportal.pwcgov.org/WebLink/0/doc/8256/Page58.aspx
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10: https://ufdc.ufl.edu/AA00062224/00217
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11: https://ufdc.ufl.edu/AA00062224/00235
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