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🔹 Introduction Percentage is one of the most important topics in Mathematics. The word percentage means “per hundred”. It is used to express a number as a part of 100. Percentage is widely used in daily life such as marks, profit and loss, discount, population, interest, comparison of quantities, etc. The symbol of percentage is %. 🔹 Basic Concept of Percentage 1% = 1/100 x% = x/100 100% = Whole quantity To convert fraction into percentage, multiply by 100 To convert decimal into percentage, multiply by 100 Examples 1/4 = 25% 0.75 = 75% 0.2 = 20% 🔹 Important Percentage Formulas 1️⃣ Percentage Formula 2️⃣ Finding Value using Percentage 3️⃣ Increase in Percentage 4️⃣ Decrease in Percentage 5️⃣ New Value after Increase 6️⃣ New Value after Decrease 🔹 Percentage Change Formula 🔹 Short Tricks for Percentage (Very Important 🔥) ✔ Interchange Trick x% of y = y% of x Example: 20% of 40 = 40% of 20 = 8 ✔ 10% Trick 10% = move decimal one place left Example: 10% of 350 = 35 ✔ 5% Trick 5% = Half of 10% Example: 5% of 200 = 10 ✔ 20% Trick 20% = Double of 10% Example: 20% of 90 = 18 ✔ 25% Trick 25% = One-fourth (¼) Example: 25% of 80 = 20 ✔ 50% Trick 50% = Half (½) Example: 50% of 120 = 60 ✔ 75% Trick 75% = 3/4 Example: 75% of 200 = 150 🔹 Multiplication Shortcut (Fast Method) Increase by x% → Multiply by (1 + x/100) Decrease by x% → Multiply by (1 − x/100) Examples: Increase 500 by 10% → 500 × 1.10 Decrease 800 by 25% → 800 × 0.75 🔹 Important Fraction–Percentage Table 1/2 = 50% 1/3 = 33⅓% 2/3 = 66⅔% 1/4 = 25% 3/4 = 75% 1/5 = 20% 1/8 = 12.5% rays classes , #Theray'sclasses , #Ray'sclasses #TheRay'sClasses / 1cuubyy5do https://www.facebook.com/profile.php?...