Percent Increase or Decrease

Front

What is percent increase?

Back

Percent increase is the amount of increase expressed as a percentage of the original amount. It is calculated using the formula: ((new value - original value) / original value) x 100.

Front

What is percent decrease?

Back

Percent decrease is the amount of decrease expressed as a percentage of the original amount. It is calculated using the formula: ((original value - new value) / original value) x 100.

Front

How do you calculate a 30% markup on an item that costs $4.25?

Back

To calculate a 30% markup, multiply the cost by 0.30 and add it to the original cost: $4.25 + ($4.25 x 0.30) = $5.53.

Front

If a population of fruit flies increases from 100 to 140, what is the percent increase?

Back

Percent increase = ((140 - 100) / 100) x 100 = 40%.

Front

How do you decrease a number by 10%?

Back

To decrease a number by 10%, multiply it by 0.90.

Front

What does the equation A=200(1.1)^t represent?

Back

This equation represents exponential growth, indicating that the initial amount is $200 and it increases by 10% each time period (t).

Front

What is the formula for calculating percent change?

Back

Percent change = ((new value - old value) / old value) x 100.

Front

If a book is priced at $20 and is marked down by 15%, what is the sale price?

Back

Sale price = $20 - ($20 x 0.15) = $17.

Front

What is the difference between a constant rate of change and a constant factor?

Back

A constant rate of change indicates a linear relationship, while a constant factor indicates an exponential relationship.

Front

How do you find the original price if an item is sold for $50 after a 20% increase?

Back

Original price = Selling price / (1 + percent increase) = $50 / 1.20 = $41.67.