https://preparationpoint.info/solved-past-papers-mcqs/ppsc-past-papers/ppsc-past-papers-2020/ziladar-punjab-irrigation-department/the-cash-difference-between-the-selling-price-of-an-article-at-a-profit-of-4-and-6-is-rs-3-the-ratio-of-two-selling-prices-is/