#Foundation
Автор: NeerajThakurMithilanchal
Загружено: 2026-02-22
Просмотров: 84
Описание:
Percentage change is one of the most important and scoring topics in Maths. It helps us understand how much a value increases or decreases compared to its original value. From profit & loss to population growth, from exam marks to business discounts — percentage change is used everywhere in real life.
In this topic, we learn: ✔️ How to calculate percentage increase
✔️ How to calculate percentage decrease
Successive percentage change is the next level. When a value increases or decreases more than once, we apply percentage step by step.
Many students make mistakes by simply adding percentages — but the correct method is multiplying the changes.
🔹 Important Formula:
If a value increases by a% and then by b%,
Net change = a + b + (ab/100)%
This concept is very useful for: • Competitive exams
• School exams (Class 6–10)
• SSC, Banking & other government exams......
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