Percent Expressions

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What is a percent expression?

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A percent expression is a way to represent a part of a whole as a fraction of 100. It is often used to describe discounts, tax rates, and tips.

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How do you calculate the sale price after a percentage discount?

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To calculate the sale price after a percentage discount, subtract the discount amount from the original price. The discount amount can be calculated by multiplying the original price by the discount percentage.

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What is the formula to calculate the final price after applying a sales tax?

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The final price after applying a sales tax can be calculated using the formula: Final Price = Original Price + (Original Price × Sales Tax Rate).

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What does a 25% discount mean in terms of price reduction?

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A 25% discount means that the price is reduced by 25 out of every 100 units of currency. For example, if an item costs $100, a 25% discount would reduce the price to $75.

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How do you express a 15% tip as a mathematical expression?

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A 15% tip can be expressed as 0.15 times the cost of the meal. If the meal costs 'x', the tip would be 0.15x.

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What is the difference between a percentage and a percent expression?

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A percentage is a number expressed as a fraction of 100, while a percent expression is a mathematical representation that includes the percentage in relation to a specific quantity.

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How do you determine which expression does NOT represent a given situation?

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To determine which expression does NOT represent a situation, analyze the context and the mathematical operations involved. Look for inconsistencies in how the percentage is applied.

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What is the significance of understanding percent expressions in real-life applications?

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Understanding percent expressions is crucial for making informed financial decisions, such as calculating discounts, taxes, and tips, which are common in everyday transactions.

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How can you convert a percentage to a decimal?

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To convert a percentage to a decimal, divide the percentage by 100. For example, 25% becomes 0.25.

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What is the formula for calculating the total cost after tax?

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The total cost after tax can be calculated using the formula: Total Cost = Original Cost × (1 + Sales Tax Rate).