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Chapter 6 Pre-Algebra Review Answer Key

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Proportions
#1 48 is what percent of 80? 60%
#2 What percent of 40 is 8? 20%
#3 What is 72% of 18? 12.96
#4 14 is 24% of what number? 58 and 1/3
#5 Fifteen students taking the state assessment exam forgot their calculator. Of the 250 students taking the exam, what percent forgot their calculator? 6%
Percent Equation & Tax
#1 A video controller cost $39. If a 6.75% sales tax is added, what is the total cost? $41.63
#2 Nine is what percent of 30? 30%
#3 Find 60% of 30. 18
#4 20 is 40% of what number? 50
#5 Marc purchases a lamp for $140. Sales tax is 6% on all purchases. How much sales tax did Marc pay? $8.40
Percent of Change
#1 What is the percent of change from 14 inches of snowfall to 35 inches of snowfall? 150%
#2 A runner ran 25 miles last week and 15 miles this week. Wha tis the percent of change? Identify if it is an increase or a decrease. decrease; 40%
#3 A swimmer swam 300 meters yesterday and 420 meters today. What is the percent of change? Identify as an increase or decrease. 40%; increase
#4 A coin dealer buys a coin for $850 and sells it for $1190. FInd the percent of change. 40%
#5 A bicycle originally priced at $225 was marked down 30%. After a week, the bicycle was marked down another 15% off the sale price. What is the percent of change from the original price to the final sale price? -40.5% or 40.5% decrease
Mark-ups and Discounts
#1 Mei buys a suit marked $60. She receives a 25% discount. What is the sale price of the suit? $45
#2 A store makes a profit of $8 on a sweater after a markup of 40%. What is the selling price of the sweater? $28
#3 Maria buys a dress marked $54. She receives a 30% discount. What is the price of the dress? $37.80
#4 A store makes a profit of $15 on a wallet after a markup of 60%. What is the selling price of the wallet? $40
#5 A $525 speaker now sells for $393.75. Find the percent of the discount. 25% discount or -25%
Simple and Compound Interest
#1 Fiona deposited $900 in the bank over 2 years. She earned $60 in simple interest at the end of the 2 years. What was the annual interest rate? 3 1/3% or 3.3%
#2 Julianna plans to borrow $3180 at 6.5% interest for 3.5 years. What amount of simple interest should she expect to pay? Round to the nearest dollar. $723
#3 An investment of $100 is compounded annually at 8%. What is the total amount of money after 2 years? $1166.40
#4 Jacqueline plans to borrow $4520 at 4.5% for 10 years. What amount of simple interest should she expect to pay? $2034
#5 An investment of $2000 is compounded annually at 5%. What is the total amount of money after 3 years? $2315.25
Final Question