Problem-Solving and Data Analysis: Percentages — Quiz 3

Questions in this quiz (10)

1. A price increases by $$15\%$$ one year and then decreases by $$15\%$$ the next year. What is the overall percent change?

   • $$0\%$$
   • $$2.25\%\ decrease$$
   • $$2.25\%\ increase$$
   • $$30\%\ decrease$$

2. A company's revenue increased from $$500000$$ dollars to $$575000$$ dollars. What is the percent increase?

   • $$10\%$$
   • $$12\%$$
   • $$15\%$$
   • $$20\%$$

3. If a number is decreased by $$20\%$$ and the result is $$64$$, what was the original number?

   • $$80$$
   • $$72$$
   • $$76$$
   • $$84$$

4. A shirt originally costs $$80$$ dollars. It is first increased by $$25\%$$, then decreased by $$20\%$$. What is the final price?

   • $$80$$
   • $$90$$
   • $$96$$
   • $$100$$

5. A quantity increases by $$x\%$$, then increases again by $$y\%$$. Which expression represents the overall multiplier?

   • $$1+x+y$$
   • $$(1+x)(1+y)$$
   • $$1+xy$$
   • $$\left(1+\frac{x}{100}\right)\left(1+\frac{y}{100}\right)$$

6. Last year, a store sold $$80$$ bicycles. This year, sales increased by $$25\%$$. How many bicycles did the store sell this year?

   • 100

7. A student's test score increased from $$60$$ to $$78$$. What is the percent increase?

   • $$18\%$$
   • $$25\%$$
   • $$30\%$$
   • $$35\%$$

8. A $$50$$ dollar item is discounted by $$30\%$$, then a $$10\%$$ sales tax is applied to the discounted price. What is the final price?

   • $$33.00$$
   • $$35.00$$
   • $$38.50$$
   • $$45.50$$

9. A population of bacteria doubles every hour. If the initial population is $$200$$, what is the population after $$3$$ hours?

   • $$400$$
   • $$800$$
   • $$1600$$
   • $$2400$$

10. A school has $$400$$ students. If $$12\%$$ are absent, how many students are present?

    • $$48$$
    • $$312$$
    • $$352$$
    • $$388$$