Why the Successive Percentage Formula is Essential
In the SSC CGL exam, the formula A + B + (AB / 100) is a highly versatile tool that allows you to calculate net changes in seconds, completely bypassing ratio and fraction methods in specific scenarios.
Where to Apply It:
- Successive Discounts: When a shopkeeper offers two discounts (e.g., -20% and -10%), the net discount is -20 - 10 + (200/100) = -28%.
- 2D Mensuration Changes: If the length of a rectangle increases by 10% and the breadth decreases by 5%, the net area change is +10 - 5 - (50/100) = +4.5% (Increase).
- Population Growth: If a town's population grows by 5% in the first year and 8% in the second year, the total 2-year growth is +5 + 8 + (40/100) = +13.4%.
The Ultra Practice Strategy
Jump into Ultra Practice Mode and set a timer for 50 questions. Mentally calculating the (A * B)/100 fraction under time pressure will train your brain to stop second-guessing itself, building the automatic reflex needed for TCS Data Interpretation questions.