# 21 Is What Percent Of 28

21 Is What Percent Of 28 – Math 10: Core 1 Math Main Topics for Chapter 6  Percent, P%, represents the ratio of “P to 100”  Therefore, P% = P/100 = P x.01  For example, 17% =

Presentation on theme: “Math 10: Basic Math 1 Key Topics for Chapter 6  Percent, P%, represents the ratio of “P to 100″  Therefore, P% = P/100 = P x.01  For example, 17 % = ” – Transcript of presentation:

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## 21 Is What Percent Of 28

Math 1 10: Basic Math 1 Key Topics for Chapter 6  Percent, P%, represents the ratio of “P to 100”  Therefore, P% = P/100 = P x.01  For example, 17% = 17/ 100 = . 17  Decimal point can be converted to percentages by moving it 2 places to the right  E.g. 0.275 = 27.5%  Fractions can be converted to percentages by first converting them to decimals  E.g. 2/5 = .4 = 40%

### Friday, April 21, 2023 Comics And Puzzles

2 Maths 10: Basic Maths for Unit 6 2 Key Topics  Problems involving percentages…  “What percent of 28 is 21?” Many can be reduced to that question. 1. “Translate” directly into the equation W% x 28 = 21 2. 0% 100% 0 W% 28 21 W 21 100 28 = W% x 28/28 = 21/28 W% = 0.75 Solve using the ratio W = 75 Px28 = 100×21 Px28/28 = 2100/28 W = 75

3 Math 10: Basic Math 3 Key Topics for Unit 6  Real World Problems Involving Interest “Cars typically depreciate by 25% in the first year. After the first year, the car is worth \$27,300. What is its original cost?”  Problems Involved:  Percentage Increase and Decrease  Taxes and Commissions  Simple and Compound Interest Simple: I = P  r  t Compound: A = P  (1 + r/n) n  t

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## Screenshot 2021 10 28 At 13.36.21

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