What is the percentage formula for finding the part given the whole?

The formula to find the part is: Part = (Percentage / 100) * Whole. For example, if you want to find 30% of 200, you calculate: (30 / 100) * 200 = 60.

How do you calculate the percentage decrease?

To calculate the percentage decrease, use the formula: Percentage Decrease = [(Old Value - New Value) / Old Value] * 100. For instance, if a price drops from $50 to $30, the percentage decrease is [(50 - 30) / 50] * 100 = 40%.

What is the formula for finding the percentage increase?

To find the percentage increase, use the formula: Percentage Increase = [(New Value - Old Value) / Old Value] * 100. For example, if a salary increases from $2,000 to $2,500, the percentage increase is [(2,500 - 2,000) / 2,000] * 100 = 25%.

If an item costs $80 and is marked up by 15%, what is the new price? Hint: First, find 15% of $80.

First, calculate the markup: (15 / 100) * 80 = $12. Add the markup to the original price: $80 + $12 = $92. The new price is $92.

A student scored 45 out of 60 on a test. What is their percentage score? Hint: Use the percentage formula for part over whole.

Percentage Score = (Score / Total) * 100 = (45 / 60) * 100 = 75%. The student scored 75%.

What is the relationship between percentage, fractions, and decimals?

Percentages can be converted to fractions and decimals. To convert a percentage to a decimal, divide by 100. To convert it to a fraction, place the percentage over 100 and simplify. For example, 25% = 25 / 100 = 0.25.

If a product is sold for $120 after a 20% discount, what was its original price? Hint: Use the relationship between the sale price and the discount.

Let the original price be x. The sale price after a 20% discount is 80% of x: 0.8x = 120. Thus, x = 120 / 0.8 = $150. The original price was $150.

What is the concept of percentage change?

Percentage change measures how much a quantity has increased or decreased relative to its original value, expressed as a percentage. The formula is: Percentage Change = [(New Value - Old Value) / Old Value] * 100.

What is the formula for calculating the percentage of a number?

The formula is: (Percentage / 100) * Total. For example, to find 15% of 200: (15/100) * 200 = 30.

What is a quick way to find 10% of any number?

To find 10% of a number, simply divide the number by 10. For example, 10% of 250 is 250 / 10 = 25.

If a laptop is priced at $800 and is on a 20% discount, what is the sale price?

Hint: Calculate the discount amount first.

First, find the discount: 20% of $800 = (20/100) * 800 = $160. Then, subtract the discount from the original price: $800 - $160 = $640. The sale price is $640.

A company's revenue increased from $50,000 to $65,000. What is the percentage increase in revenue?

Hint: Use the formula for percentage increase.

Percentage increase = [(New Value - Old Value) / Old Value] * 100. Here, the increase is $65,000 - $50,000 = $15,000. So, the percentage increase is (15,000 / 50,000) * 100 = 30%.

How do you convert a percentage to a decimal?

To convert a percentage to a decimal, divide the percentage by 100. For example, 25% as a decimal is 25 / 100 = 0.25.

What is the relationship between percentages and fractions?

Percentages represent a fraction of 100. For example, 50% is equivalent to 50/100 or 1/2.

If a product costs $120 and its price is increased by 15%, what is the new price?

Hint: Calculate the increase amount and add it to the original price.

First, find 15% of $120: (15/100) * 120 = $18. Then, add the increase to the original price: $120 + $18 = $138. The new price is $138.