Gary has been saving money for a guitar amplifier that costs $125. He has put aside $53. If the amp goes on sale for 20% off, how much more money does Gary need?

Mr. Washington left a 15% tip for a dinner that cost $36.80. About how much tip did Mrs. Washington leave?

A tomato sauce recipe calls for 1 gram of sugar. When Diego weighs the sugar on his scale, he gets a weight of 1.03 grams. Determine the percent error of this measurement.

In 1992, the population in a town was 8,000 people. In 1997, the population was 14,000. What was the percent increase in the population?

Darlene wants to buy a sweater that originally cost $32. It is on sale for 20% off. Sales tax is 6.75%. What is the final price of the sweater with tax?

Noah goes to the deli to order 2 pounds of turkey breast. When he receives his order, the weight is 1.95 pounds. What is the percent error?

Justin and Marsha did a survey for a school project. They asked sixth grade students to name their favorite type of movie. The chart given shows the results of their survey. Based on the data, what percent of the students chose comedies?

Justin bought a radio on sale for 80% off the regular price. The radio's regular price was $49.99. About how much will Justin pay, before tax?

The original price of a jacket was $66.95. Maria used a coupon for 20% off to buy the jacket. How much did she pay before tax?

Mary's bill at a restaurant was $47.59. Mary wants to leave a 20% tip. About how much tip should Mary leave?

A notebook costs $4.50 plus sales tax. After sales tax, the notebook is $4.86. What is the sales tax rate?

Joe's weekly pay increased from $80 to $100. What is the percent increase in Joe's weekly pay?

Mr. Sanchez bought 2 magazines for $9.95 each and 1 book for $14.95. If the sales tax is 6%, what is the total cost of Mr. Sanchez's purchase?