Solve Percent Problems Review

Front

What is percent error?

Back

Percent error is a measure of how inaccurate a measurement is, expressed as a percentage of the true value. It is calculated using the formula: Percent Error = |(Estimated Value - Actual Value)| / Actual Value * 100.

Front

How do you calculate the sale price after a discount?

Back

To calculate the sale price after a discount, subtract the discount amount from the original price. The discount amount can be found by multiplying the original price by the discount rate (as a decimal). Sale Price = Original Price - (Original Price * Discount Rate).

Front

What is the formula for percent change?

Back

Percent change is calculated using the formula: Percent Change = (New Value - Original Value) / Original Value * 100.

Front

If you estimate a value and the actual value is lower, how do you express the percent error?

Back

If the estimated value is higher than the actual value, the percent error is positive. If the estimated value is lower, the percent error is negative.

Front

What is a 15% tip on a $26 dinner bill?

Back

To calculate a 15% tip on a $26 bill, multiply 26 by 0.15. Tip = 26 * 0.15 = $3.90.

Front

How do you find the discount amount on an item?

Back

To find the discount amount, multiply the original price by the discount rate (as a decimal). Discount Amount = Original Price * Discount Rate.

Front

What does a percent change of 20% indicate?

Back

A percent change of 20% indicates that the new value is 20% greater than the original value.

Front

How do you express a percent error of 25%?

Back

A percent error of 25% means that the estimated value is 25% away from the actual value.

Front

What is the actual weight of Jessie's cat if her estimate was 8 pounds and the percent error is 20%?

Back

If the percent error is 20%, the actual weight can be calculated as: Actual Weight = Estimated Weight / (1 - Percent Error) = 8 / (1 - 0.20) = 10 pounds.

Front

What is the sale price of a $900 television with a 30% discount?

Back

The discount amount is $900 * 0.30 = $270. The sale price is $900 - $270 = $630.