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what is 20 of $18

what is 20 of $18

less than a minute read 05-02-2025
what is 20 of $18

What is 20% of $18? A Simple Percentage Calculation

Finding 20% of $18 is a common percentage problem. Understanding how to solve this type of problem is useful in everyday life, from calculating discounts to figuring out tips. Let's break down how to get the answer and explore some different methods.

Method 1: Converting the Percentage to a Decimal

The most straightforward approach is to convert the percentage to a decimal and then multiply.

  • Step 1: Convert the percentage to a decimal: 20% is equivalent to 0.20 (or simply 0.2). You do this by dividing the percentage by 100 (20/100 = 0.2).

  • Step 2: Multiply the decimal by the original amount: Multiply 0.2 by $18: 0.2 * $18 = $3.60

Therefore, 20% of $18 is $\boxed{3.60}.

Method 2: Using Fractions

Percentages can also be expressed as fractions. This method can be helpful for simpler percentages.

  • Step 1: Express the percentage as a fraction: 20% is equivalent to 20/100, which simplifies to 1/5.

  • Step 2: Multiply the fraction by the original amount: Multiply (1/5) by $18: (1/5) * $18 = $3.60

Again, we find that 20% of $18 is $\boxed{3.60}.

Method 3: Finding 10% and Doubling

This is a mental math shortcut for calculating 20%.

  • Step 1: Find 10%: 10% of $18 is $1.80 ($18 / 10 = $1.80).

  • Step 2: Double the result: Since 20% is double 10%, double $1.80: $1.80 * 2 = $3.60

This method quickly arrives at the answer: 20% of $18 is $\boxed{3.60}.

Real-World Applications

Understanding how to calculate percentages is valuable in many everyday scenarios:

  • Sales Tax: Calculating the sales tax on a purchase.
  • Discounts: Determining the savings from a sale or coupon.
  • Tips: Figuring out an appropriate tip at a restaurant.
  • Interest: Calculating simple interest on a loan or savings account.

Mastering percentage calculations will help you make informed financial decisions and better understand numerical information presented in various contexts.

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