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Sagot :
Step-by-step explanation:
1. Use the percentage formula: P% * X = Y
Example: What is 10% of 150?
• Convert the problem to an equation using the percentage formula: P% * X = Y
• P is 10%, X is 150, so the equation is 10% * 150 = Y
• Convert 10% to a decimal by removing the percent sign and dividing by 100: 10/100 = 0.10
• Substitute 0.10 for 10% in the equation: 10% * 150 = Y becomes 0.10 * 150 = Y
• Do the math: 0.10 * 150 = 15
• Y = 15
• So 10% of 150 is 15
• Double check your answer with the original question: What is 10% of 150? Multiply 0.10 * 150 = 15
2. Use the percentage formula: Y/X = P%
Example: What percent of 60 is 12?
• Convert the problem to an equation using the percentage formula: Y/X = P%
• X is 60, Y is 12, so the equation is 12/60 = P%
• Do the math: 12/60 = 0.20
• Important! The result will always be in decimal form, not percentage form. You need to multiply the result by 100 to get the percentage.
• Converting 0.20 to a percent: 0.20 * 100 = 20%
• So 20% of 60 is 12.
• Double check your answer with the original question: What percent of 60 is 12? 12/60 = 0.20, and multiplying by 100 to get percentage, 0.20 * 100 = 20%
3. Use the percentage formula Y/P% = X
Example: 25 is 20% of what number?
• Convert the problem to an equation using the percentage formula: Y/P% = X
• Y is 25, P% is 20, so the equation is 25/20% = X
• Convert the percentage to a decimal by dividing by 100.
• Converting 20% to a decimal: 20/100 = 0.20
• Substitute 0.20 for 20% in the equation: 25/0.20 = X
• Do the math: 25/0.20 = X
• X = 125
• So 25 is 20% of 125
• Double check your answer with the original question: 25 is 20% of what number? 25/0.20 = 125
4. Remember how to convert a percentage to a decimal.
• Remove the percentage sign and divide by 100
• 15.6% = 15.6/100 = 0.156
5. Remember how to convert a decimal to a percentage.
• Multiply by 100 and add a percentage sign
• 0.876 = 0.876 * 100 = 87.6%
#CarryOnLearning
There are nine variations on the three basic problems involving percentages.
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