Percentage and ratio

This chapter provides a comprehensive, zero-to-one mastery of Percentage and Ratio strictly for the Delhi Police Constable (Executive) exam. It covers fraction conversions, successive changes, combined ratios, income-expenditure concepts, and exact exam applications. By mastering these two foundational pillars, aspirants can solve not only direct questions but also optimize their speed in Data Interpretation, Profit & Loss, and Time & Distance. We break down the examiner's mindset, common calculation traps, and rapid-fire mental math techniques required to clear the cut-off.