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Percents and Their Operations

Math ⇒ Number and Operations

Percents and Their Operations starts at 6 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Percents and Their Operations. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
A car's value depreciates by 20% each year. If its current value is $10,000, what will it be worth after 2 years?
A shirt is marked up by 30% from its cost price of $40. What is the selling price?
A solution contains 12 grams of salt in 300 grams of water. What is the percent concentration of salt?
A store increases the price of a $200 item by 10% and then offers a 10% discount on the new price. What is the final price?
A student scores 42 out of 56 on a test. What is the percentage score?
A value increases by 20% and then by another 10%. What is the overall percent increase?
Explain the difference between percentage points and percent change.
Explain why multiplying by 1.25 increases a number by 25%.
If 12% of a number is 48, what is the number?
If 18 is increased by 50%, what is the result?
If 25% of a class of 48 students are absent, how many students are present?
If 40 is what percent of 160?
If a product originally costs $120 and is discounted by 25%, what is the sale price?
If a salary of $2,500 is increased by 8%, what is the new salary?
If a value decreases from 500 to 350, what is the percent decrease?
What is 15% of 240?
A country’s inflation rate was 6% last year and is projected to be 4% this year. What is the total percent increase in prices over the two years, compounded?
A population of bacteria increases by 25% every hour. How many hours will it take for the population to more than triple? (Give the smallest integer value of hours.)
A product is subject to two successive discounts of 20% and 15%. What is the single equivalent percent discount?
A solution is made by mixing 200 mL of a 30% saline solution with 300 mL of a 10% saline solution. What is the percent concentration of the resulting mixture?